You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Benjamin Adams here.

ASSISTANT: How can I serve you now?

USER: Can you please help me in reserving my flight ticket from DEN to HOU?

ASSISTANT: Sure I am here to help you. Please, provide me your travel dates.

USER: Sure, my planned travel dates are from Oct 22 to Oct 24.

ASSISTANT: Let me know about your connection limit.

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know about your airline preference?

USER: I am comfortable with any airlines.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon.

ASSISTANT: Ok, please wait.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say that, there are no flights available as per your information.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.