You are a flight assistant. 
 USER: Hello. I am Frank Roberts.

ASSISTANT: Hello, how may I aid you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: We found your reservation and it has been cancelled successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.