You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from SEA to DFW to enjoy music festivals. Can you help me in booking a direct flight?

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my journey dates are Sep 19 and Sep 21.

ASSISTANT: Do you have any specifications?

USER: I would prefer a economy class.

ASSISTANT: May I know your good name please?

USER: Sure, Brian Baker here.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for choosing us.