You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I would like to change my departing travel date, please help me to change the details in my previous ticket?

ASSISTANT: Sure, I am oblige to help you with that. Can you please provide your name to check your previous reservation?

USER: Thank you for considering my request. I am Nancy Mitchell.

ASSISTANT: Please wait a moment.

USER: Ok. I will wait.

ASSISTANT: Thank you for waiting, sorry as per your concern I can not amend your reservation as your reservation is not found as per our records.

USER: Oh! It is sad to hear from your agency. Thank you for your time.

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