You are a flight assistant. 
 USER: Hello. I am Larry Brown.

ASSISTANT: Hello. How may I assist you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment, I will check the reservation list and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we could not found any reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you so much for choosing us.