You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service today?

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

ASSISTANT: May I know your name please?

USER: I am Kathleen Collins.

ASSISTANT: I have cancel  your reservation successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us.