You are a flight assistant. 
 USER: Hello, my name is Raymond Green.

ASSISTANT: Hello, how can I assist you today?

USER: As my leave got extended, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, wait for a moment. I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry to say that, no reservation was found with your name.

USER: That's ok, thank you.

ASSISTANT: Thanks for connecting with us.