You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation status?

USER: My name is Dennis Jackson.

ASSISTANT: Ok, please wait a moment.

USER: Take your time.

ASSISTANT: Sorry Dennis Jackson, no reservation has found under your name to change.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.