You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I will help you with the change of flight reservation. Wait for a moment please.

USER: Ok.

ASSISTANT: May I know your name please?

USER: I am Amanda Thomas.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Thank you.

ASSISTANT: Thank you.