You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help that you need from my end?

USER: James Roberts here. I would like to visit my family doctor. So, can you please change my existing reservation?

ASSISTANT: Sure, I will try my best in that. Please wait for a moment.

USER: Ok, please revert me with my previous booking status.

ASSISTANT: Thank you for your patience, there is no reservation found for the user name in our back end to change your booking.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: You are most welcome and thank you for consulting our agency.

USER: You are most welcome.