You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I amend you today?

USER: I am Cynthia Edwards. Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, may I know your good name to check the reservation on your name? Please wait for a wait.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: Not an issue. Thank you.

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