You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am planning to meet my business partner's at Minneapolis. Could you please help me in reserving the ticket from BOS to MSP?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would like to travel on Sept 13, and again I will return back on Sept 15.

ASSISTANT: Ok, do you have any specifications?

USER: I would like to fly in the normal-cost.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you. May I know your name please?

USER: Myself Justin Hall.

ASSISTANT: Sorry Justin Hall, there are no flights available on your requested dates.

USER: Not a big problem, anyhow thank you very much for your information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.