Dear {Recipient},

I'm sorry for flaking out on you {yesterday/last night}. You know I hate backing out on my commitments.
Unfortunately, {reason}, so I had no choice but to cancel at the last minute.

I understand if you're upset and don't want to talk to me right now. But I'd like to make it up to you as soon as possible. So if you're free sometime this week, please let me treat you to {a coffee/lunch/a movie}. What do you say?

Best,

{Your Name}

Dear {Recipient},

I apologize for flaking out on our lunch date {yesterday/the other day}. I was really looking forward to spending some time with you and chatting about {topic}, so I was just as upset as you were when I had to cancel unexpectedly due to {reason}. I hope you understand.

Of course, I'd still love to have lunch with you, so please let me know your availability this week or next. I'm looking forward to hanging out with you really soon!

Warm regards,

{Your Name}

Dear {Recipient},

You probably weren't expecting to get a letter from me, but I've always felt bad for disappearing on you back then. So here I am now, offering you my sincere apology--I know it's {number of} {weeks/months/years} late, and I'm not sure if you even want to hear it, but I'm sorry. I'm sorry I ghosted you.

I know it sounds so cliche, but it was me, not you. And I didn't have the guts to tell you, so I dipped.
I'm not expecting a reply or anything. I just wanted to let you know how sorry I am for ruining our relationship. I hope you're happy now and with someone who treats you better.

Sincerely,

{Your Name}

Dear [Name],

We are writing to apologize for the unreliable delivery of your order. We understand that you have been waiting for your order for some time now, and we apologize for the delay.

We take pride in providing our customers with the highest quality of service, and we are sorry that we have not been able to meet your expectations. We understand that this delay has caused you inconvenience and we would like to make it up to you.

We would like to offer you a [discount/credit/free item] as a token of our apology. We hope that this will help make up for the delay in your order.

We understand that you may be frustrated with this delay, and we want to assure you that we are taking steps to ensure that this does not happen again. We are currently working on improving our delivery system to make sure that our customers receive their orders on time.

We apologize once again for the delay in your order and we hope that you will accept our apology. We value your business and we want to make sure that you are satisfied with our service.

Sincerely,

[Name]

Dear [Name],

I am writing to apologize for the unreliable services you have experienced with our company. We understand that you have encountered some issues with our services, and we sincerely apologize for any inconvenience this has caused you.

We take customer satisfaction very seriously and we are sorry that we have not been able to provide you with the level of service that you deserve. We understand that our services are a reflection of our company and our commitment to our customers and we take full responsibility for the issues you have experienced.

We have taken steps to ensure that this kind of issue does not occur again in the future. We have implemented a system to monitor our services and ensure that they are up to the standards that our customers expect. We have also increased our staff to ensure that any issues that arise can be addressed quickly and efficiently.

We understand that this issue has caused you frustration and we are sorry for that. We value your business and we want to make sure that you are satisfied with the services we provide. We hope that you will give us another chance to show you that we are committed to providing the best possible service.

Once again, we apologize for the unreliable services you have experienced. We are taking steps to make sure that this does not happen again and we hope that you will give us the opportunity to show you that we are committed to providing the best possible service.

Sincerely,

[Your Name]