You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: My name is Jessica Lopez. My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure, wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry to say that, no reservation was found with your name.

USER: No problem, thanks for your service.

ASSISTANT: Thanks for choosing us. Have a nice day.