You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Ok, please can I know your name to amend the reservation?

USER: I am Stephanie Thomas.

ASSISTANT: Ok, can you wait a moment?

USER: Sure.

ASSISTANT: Thank you for waiting, sorry as per the reservation records your ticket is not available to change.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing our agency.