You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you now?

USER: I want to change my recent reservation, Due to the meeting has been placed to another location. Can you help me with that?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: William Jones, is my name.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thanks for approaching us, have a good day.