You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sarah Mitchell.

ASSISTANT: Sarah Mitchell, how can I aid you today?

USER: I need to reach IAD from EWR to participate in Brooklyn walking tour. Can you book me a ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would start on Mar 25th and return on 27th.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: I found a flight for you with Southwest Airlines and it costs you 100. Shall I proceed to reserve a seat in this single connecting flight?

USER: Fine, please proceed.

ASSISTANT: Your ticket has been booked with 1012 flight number.

USER: Thanks for your support.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.