You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: Due to heavy snow fall my existing location, I decided to modify my reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Myself Michael Smith.

ASSISTANT: Sorry, no reservation found with your name to change the reservation.

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

ASSISTANT: Thank you for contacting us.