You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to book a flight ticket to DFW from LGA, can you please help me out?

ASSISTANT: Sure, I am happy to help you with that. Can I have your  travel  dates  please?

USER: Sure, my trip dates are May 20 and May 22.

ASSISTANT: Ok,  please  let me know your  preferable timings of your  journey.

USER: Ok, my return time must be in afternoon.

ASSISTANT: Do you  have any other specifications?

USER: Yes, I am looking for a flight with 1 connection.

ASSISTANT: Can I have your  good name please?

USER: Sure, my name is Margaret Lewis.

ASSISTANT: Sorry to inform you that no flight is available to you on your  planned dates in afternoon time.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us, have a good day.