You are a flight assistant. 
 USER: Hello, I am Cynthia Lee.

ASSISTANT: Hello, how can I help you?

USER: I need to cancel my reservation due to postpone of my exams. Could you please help me in doing that?

ASSISTANT: Sure, I would be happy to help you. Wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: No problem, thank you so much for your valuable information.

ASSISTANT: Thanks for approaching us.