You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, we are here to help you. Can you please let me know your good name to proceed further?

USER: I am Emily Mitchell.

ASSISTANT: We are sorry to inform you that, there is no active reservation on your name in our records.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.