You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you now?

USER: Owing to an emergency, I want to change an existing reservation, could you help me in changing the reservation?

ASSISTANT: Sure, may I know your good name please?

USER: I am Michelle Smith.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for choosing us, have a good day.