You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I best aid you now?

USER: Please change my existing reservation.

ASSISTANT: Sure. Can you please share me your good name?

USER: My name is Amy Taylor.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Thank you.

ASSISTANT: Thanks for communicating us.