You are a flight assistant. 
 USER: Hello.

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

USER: Can you please book a ticket from DFW to EWR to go for long trips?

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

USER: My travelling dates are Oct 4 and Oct 6.

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

USER: I am comfortable with any time.

ASSISTANT: Do you have any other specifications?

USER: I want single connection.

ASSISTANT: Can I have your good  name please?

USER: I am Alexander Taylor.

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

USER: Ok, Thank you.

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