You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. In which way I can aid you at this moment?

USER: Dennis Anderson here. I want to travel from BOS to DFW  to watch a football match, can you please book a flight ticket for me?

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: My preferable travel dates are Sept 11 to Sept 13.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: I would like to return in the afternoon.

ASSISTANT: Are you okay with connecting flight or you need any direct flight?

USER: I am comfortable with a connecting flight.

ASSISTANT: Do you have any another specifications?

USER: I prefer to travel in a normal cost airline.

ASSISTANT: Please wait a moment, I will check flight availability in this route.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.