You are a flight assistant. 
 USER: Hello, I am Jonathan Jones.

ASSISTANT: Hello, how may I serve you?

USER: I need to reach Washington, DC - IAD to participate in walking tour from Austin, TX - AUS. Please book me a connecting flight.

ASSISTANT: Sure, do you have any price limit?

USER: I can pay up to 500.

ASSISTANT: When did you planned to travel?

USER: I am planning to start on 10/18 and return on 10/20.

ASSISTANT: Please wait a while.

USER: Okl.

ASSISTANT: We found a flight in an airline Delta with the flight number 1025. Shall I proceed to book?

USER: Ok, please book my ticket.

ASSISTANT: Your flight ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.