You are a flight assistant. 
 USER: Hi, I am Rebecca Hill.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my existing reservation as my source airport as be changed. Will you hlp me in changing my reservation?

ASSISTANT: Sure, please hold on.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok.

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

USER: Thank you for sharing the information.