You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am George Robinson. I am planning to change an reservation, due to some urgent work. Can you please change my reservation?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Sure, take your own time.

ASSISTANT: George, no reservation has been found on your name in our database.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for choosing us.