You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I made a reservation earlier to visit Las Vegas in direct flight but now I want to travel in connecting flight. can you help me in changing my reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Sandra Phillips.

ASSISTANT: Ok, please wait for sometime.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.