You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my reservation due to some tornado going in my destination. Can you help me?

ASSISTANT: Sure, I will assist you with that. May I know your name for checking the existing reservation?

USER: Ok. Myself Melissa Hill.

ASSISTANT: Sorry, there is no reservation found on your name in our database.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.