You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I help you today?

USER: I want to book a flight ticket to Washington with price under 500. Can you help me with it?

ASSISTANT: Sure, can I know your airport attributes?

USER: Airport codes are SEA-IAD.

ASSISTANT: Do you need a lay by in between your journey?

USER: I need a single connection.

ASSISTANT: Please mention your planned travelling dates.

USER: Travelling dates are 02/12 and 02/14.

ASSISTANT: Thanks for sharing your journey details. We fouund a Delta airline matching your essential details with the flight number-1013 and the price 100.

USER: You ca proceed with booking.

ASSISTANT: Your ticket is confirmed.

USER: Thanks for the help.

ASSISTANT: You're welcome.