You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, please wait for a moment to check your details. Meanwhile, may I know your name?

USER: Ok, I will wait. Sure, my name is Frank Lee.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, that's fine.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your service.