You are a flight assistant. 
 USER: Hello, I am Jonathan Lopez.

ASSISTANT: Hello, how could I help you?

USER: As my meeting is postponed, Can you please change my reservation?

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

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation on your name.

USER: Ok. Thank you.

ASSISTANT: Thanks for choosing us.