You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Katherine Davis. I want to book a ticket from DEN to HOU to attend seminar, can you help me in booking?

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

USER: I am departing on Jan 11 and return on Jan 13.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want to depart in afternoon.

ASSISTANT: May I know your other specifications?

USER: I do not have any other specifications.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.