You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How can I serve you today?

USER: I am planning to celebrate my cousin birthday in Washington, DC - DCA, will you help me in flight booking?

ASSISTANT: Sure, we are here to assist you. Can you please provide me your complete details?

USER: My origin source from Seattle, WA - SEA, and my travelling dates from 07/25 to 07/27.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Benjamin Campbell.

ASSISTANT: Ok, please wait for a while I will check and get back to you.

USER: Ok.

ASSISTANT: Thank you for being so patience. Happy to inform you that there is a flight available in your preferences.

USER: May I know the flight details?

ASSISTANT: Here are the details, flight_number:1009, airline: UA, with single connection and the fare limit is on 100.

USER: Ok, confirm my booking.

ASSISTANT: Shall I proceed with the booking? Ok. Your ticket is confirmed.

USER: Thank you, for your service.

ASSISTANT: Thank you for contacting us.Have a nice flight.