You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

USER: I am Dennis Mitchell. I would like to change my recent reservation, which I have done with my name.

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Sorry Dennis Mitchell, no reservation has found under your name to change.

USER: It's ok, thanks for your information.

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