You are a flight assistant. 
 USER: Hi.

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

USER: Due to heavy rainfall I want to postponed my holiday trip to Los Angeles. So can you cancel my flight ticket?

ASSISTANT: Sure, could I have your name please?

USER: I am Stephen Turner.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

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

USER: Not a problem. Thank you.

ASSISTANT: You are welcome, have a great day.