You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I want to cancel my reservation because my trip has been postponed. Can you assist me in cancellation process?

ASSISTANT: Sure, I am glad to help you. Could you please tell us your name?

USER: Justin Collins.

ASSISTANT: Justin Collins, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation with your name in our portal to cancel further.

USER: No problem, thank you for searching.

ASSISTANT: You are welcome, have a great day.