You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I need to change my recent reservation, could you help me in doing that?

ASSISTANT: Ok, may I know your name to check your reservation status?

USER: I am Timothy Green.

ASSISTANT: Sorry to say, there is no reservation found on your name to change it.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us, have a nice day.

USER: Thank you for the information.

ASSISTANT: Welcome Timothy Green.