You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation.

ASSISTANT: Sure, we are here to help you. May I know your good name?

USER: My name is Deborah Jackson.

ASSISTANT: No reservation found with your name.

USER: Ok, no problem. Thanks for the information.

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