You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Edwards.

ASSISTANT: How can I assist you today?

USER: Please help me in changing my recent reservation.

ASSISTANT: Ok, please wait a moment I will check.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that there is no reservation been found on your name to change.

USER: That's ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing our agency.