You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I would like to book a ticket from DFW to PHL to meet my sister.

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

USER: My travelling dates are Jan 13 and Jan 15.

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

USER: No, I do not have any preferable timings.

ASSISTANT: Do you have any more specifications?

USER: I need a break in between the journey.

ASSISTANT: Can I have your good name please?

USER: I am Sarah Davis.

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

USER: No problem, thank you for the information.

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