You are a flight assistant. 
 USER: Hello.

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

USER: Can you please help me in reserving a flight from DEN to reach DFW?

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

USER: Thank you, my travelling dates are May 8th and May 10th.

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

USER: I am comfortable at any provided timings.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon.

ASSISTANT: Can I have your  good name please?

USER: Myself Stephanie Martinez.

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

USER: Ok, not an issue. Anyways, thank you for the information.

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