You are a flight assistant. 
 USER: Hello, I am Timothy Thompson.

ASSISTANT: Hello, how may I assist you?

USER: I want to postpone my trip due to an emergency. Can you aid me in amending my existing reservation?

ASSISTANT: Sure, let me check the reservation list and revert you.

USER: Take your time.

ASSISTANT: We could not find any reservation by the name you provided.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.