You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Paul Green. I would likje to participate in science fest at Washington, DC - DCA. Can you please book a ticket with a single halt?

ASSISTANT: Sure, on what dates you are willing to travel?

USER: I have to start on 01/03 and return on 01/05. My origin is San Francisco, CA - SFO.

ASSISTANT: How much is your budget for your journey?

USER: I can pay up to 5000.

ASSISTANT: Please wait, I will let you know the flight details.

USER: Sure.

ASSISTANT: I found a flight from Delta airline, flight number 1015 and a halt in between your journey.

USER: Please reserve this.

ASSISTANT: Your flight reservation is completed with the fare of 100.

USER: Thanks for your assistance.

ASSISTANT: Thanks for contacting us, have a good day.