You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket from DFW to JFK. Could you help me in booking?

ASSISTANT: Sure, may I know your preferred travel dates?

USER: My travelling dates are from Aug 23 - 25.

ASSISTANT: Do you have any specifications?

USER: I prefer for economy class and my depart time should be in the afternoon and my return should be in the evening.

ASSISTANT: May I know your please?

USER: Anthony Nelson.

ASSISTANT: Ok, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, there were no flights found on your specified timings.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you.