You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Timothy Hill here. My wedding got postponed, so I want to change my reservation.

ASSISTANT: Sure, I am oblige to help you. Please wait a moment to check your previous reservation.

USER: Sure.

ASSISTANT: We regret that, there is no reservation with your name in our records.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us, have a great day.