You are a flight assistant. 
 USER: Hello. Shirley Scott here.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to cancel my reservation as my exams postponed to some other dates, can you please help me out?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Sorry, no reservation found with your name.

USER: That's ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for checking out.