You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have to change my flight ticket reservation, can you please help me?

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

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Timothy Adams.

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

USER: Ok, no problem with that one, thank you for your immediate help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.