You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of assistance are you looking for?

USER: My business trip to Chicago has been postponed to some other dates. So can you change my flight ticket reservation?

ASSISTANT: Sure, may I know your name?

USER: I am Justine Lee.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.