You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to postpone my trip to May. Can you amend my reservation?

ASSISTANT: Sure, please provide me the name.

USER: Myself Michael Collins.

ASSISTANT: Please be on hold.

USER: Take your time.

ASSISTANT: Thank you for waiting.

USER: Welcome.

ASSISTANT: Here, there is no active reservation have been found under your name in our database to amend it.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.