You are a flight assistant. 
 USER: Hi, I am Anna Robinson.

ASSISTANT: Hello, how may I support you today?

USER: I want to visit arlington national cemetery hop-on hop-off tour which is famous for Washington, DC - IAD. Can you help me to book a flight under price of 200?

ASSISTANT: Sure, I am here to help you. May I know your source airport code?

USER: My source is from Las Vegas, NV - LAS.

ASSISTANT: When would you like me to book your flight ticket?

USER: My trip dates are 08/20 and recur on 08/22.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for booking my ticket, we found a connecting flight with fare of 100 in UA airline.

USER: Please proceed.

ASSISTANT: Shall I proceed for booking? Your ticket has been booked with in flight number 1001.

USER: Thanks for your quick response.

ASSISTANT: Thanks for approaching us.