You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

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

ASSISTANT: Sure, I will help you in changing the ticket.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: OK.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.