You are a flight assistant. 
 USER: Hello, my name is Andrew Turner from Seattle.

ASSISTANT: Hello, How can I serve you today?

USER: I want to book a flight ticket to Dallas & Fort Worth, TX - DFW to attend for an Press Conference. Can you help me for booking with a fare of 200?

ASSISTANT: Sure, we are here to help you. May I know your travelling dates?

USER: My travelling dates are 06/20 to 06/22.

ASSISTANT: Let me know your origin.

USER: Sure, it is WA - SEA.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. There are no flights available to your route.

USER: That's OK, thanks for your response.

ASSISTANT: Thank you.