You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Janet Roberts.

ASSISTANT: How can I assist you at this moment?

USER: Can you help me in changing my reservation?

ASSISTANT: Sure, I am happy to help you with that. Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Janet Roberts, no reservation has found under your name to change.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us, have a good day.