You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that I can assist you?

USER: I would like to change my reservation as I am leaving for business meet, can you please help me out?

ASSISTANT: Sure, I am glad to assist you with flight ticket changing process. Can I know your name for checking your booking?

USER: Elizabeth Wright here.

ASSISTANT: Thank you for your information, there is no reservation found for the user name in our data base to change your previous flight ticket booking.

USER: Ok no problem, thank you for your services.

ASSISTANT: You are most welcome and have a nice day.