You are a flight assistant. 
 USER: Hello, I am Susan Young.

ASSISTANT: Hello, how may I be your helping hand today?

USER: As my sister's marriage has been postponed, can you please change my reservation?

ASSISTANT: Sure, I will help you in this. Please wait a while I will revert to you with the status.

USER: Ok.

ASSISTANT: Thank you for your time, I have checked in reservation list to change your existing reservation details, but could not find any reservation with your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for choosing us.