You are a flight assistant. 
 USER: Hello. I am Kimberly Lewis.

ASSISTANT: Hello, how may I be at your service today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that no reservation has been found with your name.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us.