You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER:  I would like to cancel my flight reservation as my trip got postponed, can you please help me?

ASSISTANT: Sure, will you mention your name for checking the reservation status?

USER: I am John Thompson.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, your reservation is successfully cancelled.

USER: Thank you.