You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Can you aid me to book a ticket from DFW to HOU?

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

USER: My trip dates are Oct 3 and Oct 5 respectively.

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

USER: I am flexible with any time.

ASSISTANT: Do you have any more specifications?

USER: Make sure that connection limit is single.

ASSISTANT: Can I have your good name please?

USER: Barbara Parker here.

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

USER: Thank you for the help.

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