You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christine Edwards here.

ASSISTANT: May I know your concern please?

USER: I would like to change my existing reservation now, can you help me with it?

ASSISTANT: Please wait a moment while I check the records of reservations.

USER: Ok, please check with my previous booking and let me know the status of my previous reservation.

ASSISTANT: Sorry, there is no reservation been found on the name you have provided.

USER: Oh! That's very sad to hear from your side. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing our agency, have a nice day.

USER: Most welcome.