You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to book a ticket from HOU to DFW. Can you please help me out?

ASSISTANT: Can you give me your trip dates?

USER: I am planning to travel on Aug 25 and return back on Aug 27.

ASSISTANT: Do you need any connections?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Are there any more specifications?

USER: Yes, my return time is evening and I am looking for a business class.

ASSISTANT: Your name please.

USER: I am Steven Allen.

ASSISTANT: Sorry to say that, there are no flights with your details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.