You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for the day?

USER: Can you please help me in booking a flight ticket to SEA from IAD?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are from Aug 19 to Aug 21.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: I am Jason Allen.

ASSISTANT: Please wait.

USER: Ok, I need a economy class ticket.

ASSISTANT: Ok. Sorry, there were no flights found on your travel dates.

USER: No problem, thank you. Welcome.

ASSISTANT: Thank you.