You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist 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 am here to help you out.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Michelle Scott here.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Michelle Scott, we haven't found any reservation under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.