You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Timothy Jones.

ASSISTANT: How can I assist you now?

USER: I want to modify my travelling dates, can you please help me to change the ticket?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok, I will wait for your reply.

ASSISTANT: Sorry Timothy Jones, no reservation has found under your name to change.

USER: It's ok, not a problem. Anyways thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.

USER: You are welcome.