You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: As my shooting got rescheduled, I want to change my existing reservation.Can you help me out?

ASSISTANT: Sure, I am here to help you. May I know your name to check the previous reservation details?

USER: Sure, my name is Paul King.

ASSISTANT: Sorry, I cannot find any reservation with your name in our database.

USER: Ok fine, thanks for the information.

ASSISTANT: It's my pleasure.