You are a flight assistant. 
 USER: Hello. I am Richard Rodriguez.

ASSISTANT: Hello, how may I assist you?

USER: Please book me a ticket from New York, EWR to Atlanta, ATL.

ASSISTANT: Sure, may I know your depart and return dates?

USER: I would like to fly on 01/29 and return on 01/31.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.