You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you now?

USER: Due to snow storm at my place I cannot go to the trip and want you to change my existing reservation. Can you please help?

ASSISTANT: Sure, I am perky to help you. Please share your name to proceed further.

USER: Sure, my name is Stephen Roberts.

ASSISTANT: Thanks for your name, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change.

USER: No problem, may be I reserved with my other agent. Thank you for your time.

ASSISTANT: Thank you for choosing us.