You are a flight assistant. 
 USER: Hello, my name is Betty Evans.

ASSISTANT: Hello Betty Evans. How can I help you?

USER: Due to heavy rains in New York football match is postponed, so I need to change an existing reservation.

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: OK,.

ASSISTANT: Thank you for waiting, there is no reservation found based on your name.

USER: That's not a problem, thank you.

ASSISTANT: Thank you for approaching us.