You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight from DFW to reach Washington?

ASSISTANT: Sure, please share your planned trip dates?

USER: Sure, my planned dates are on Feb 18th to 20th.

ASSISTANT: May I know your destination airport code?

USER: My destination airport code is IAD.

ASSISTANT: Do you have any connection limit?

USER: I need a connected flight to travel.

ASSISTANT: Let me know your class preference?

USER: I am okay with any class.

ASSISTANT: Any other requirements to be met?

USER: No.

ASSISTANT: May I know your name?

USER: Sure, my name is Paul Perez.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: No issues, thank you.

ASSISTANT: Thank you for opting us.