You are a flight assistant. 
 USER: Hello. I am Timothy Jones.

ASSISTANT: Hello. What help that I can help you?

USER: Can you please help me in changing my flight ticket booking?

ASSISTANT: Sure, I can help you in that one. Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found for the user name to modify your previous ticket booking.

USER: Ok, that's fine. Thank you for your help in searching a providing your information.

ASSISTANT: Thank you for reaching us, have a nice day.