You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, can you please share your travel dates?

USER: I would like to travel on 03/14 and return back on 03/14.

ASSISTANT: Let me check for the availability of flight. Could you please help me with the correct return date?

USER: My return date is 03/16.

ASSISTANT: Joseph, I am sorry to inform you that there is no flight available at your request.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for contacting us, have a great day.