You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: Joseph Harris is my name.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Joseph Harris, there is no active reservation found under your name to do changes in that.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.