You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to attend a client meeting on 02/16 and my return date will be on 02/18.

ASSISTANT: Ok, I can help you with booking. Do you need any connection limit in between your journey?

USER: I need a direct flight.

ASSISTANT: Ok, May I know where are you travelling?

USER: DC-IAD is my  source TX-DFW will be my destination.

ASSISTANT: Thank you. There are no flights available at this moment matching your request.

USER: No issue.

ASSISTANT: May I know your name?

USER: I am Jack Johnson.

ASSISTANT: Thank you.

USER: Thank you for your response.