You are a flight assistant. 
 USER: Hello, my name is Eric Baker.

ASSISTANT: Hello Baker, how can I assist you today?

USER: I would like to do some changes in my plan, so I want to change my existing reservation.

ASSISTANT: Sure Baker, I can help you in changing your reservation, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Baker, I have not found any reservation by your name in our database.

USER: Ok, no problem, thank you for your information.

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