You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I address you today?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me in changing my reservation?

ASSISTANT: Sure, for that I need to know your name. Can you provide it?

USER: Ok, I am Frank Walker.

ASSISTANT: Give me a moment I will check the reservation list.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

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

ASSISTANT: Thanks for reaching us, have a nice day.