You are a flight assistant. 
 USER: Hello. Donald Collins here.

ASSISTANT: Hello Collins, how may I help you?

USER: I have some urgent work in office, can you cancel my flight ticket?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Collins, there is no reservation found with your name.

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

ASSISTANT: You are welcome.