You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to heavy snowfall, I want to change my existing reservation. Please help me out.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: My name is Nancy Jones.

ASSISTANT: Jones, no reservation has been found on your name in our database.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.