You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: James Wright here. Can you help me in changing my previous reservation?

ASSISTANT: Sure, I will help you out.

USER: Thanks.

ASSISTANT: Please wait for a while. Sorry, there are no reservations found.

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

ASSISTANT: Thank you for reaching us.