You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to book a flight ticket to DFW. Can you please make a reservation from JFK?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are on July 22 and 24.

ASSISTANT: Do you have any specifications?

USER: My return time is afternoon.

ASSISTANT: Please share me your name.

USER: My name is Carol Martinez.

ASSISTANT: Sorry, there is no flight at this moment.

USER: ok, thank you.

ASSISTANT: Thank you.