You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am William Mitchell. I planned to meet my friend in ORD, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, can you provide your journey dates?

USER: I prefer to travel on 05/19 and 05/21. I need a direct flight.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: There is a connecting flight with number 1024 in airline UA, the fare is 100. Can I book it?

USER: Ok, please reserve me a seat.

ASSISTANT: Your ticket is reserved, happy journey.

USER: Thank you.

ASSISTANT: Thank you for opting us.