You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Lewis.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Arlington national cemetery hop-on hop-off tour in Washington DCA. Can you help me to book a connecting flight?

ASSISTANT: Sure, I can help you with that. May I know your source airport code please?

USER: My source is from Boston, BOS.

ASSISTANT: Ok, can you please provide your planned departure and return travel dates?

USER: My trip dates are Jan 06 and 08.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: I don't have any specifications.

ASSISTANT: Fine, Delta airlines is providing a flight on that route with ticket fare of 100, is that ok for you?

USER: Please proceed.

ASSISTANT: I have successfully booked your ticket with flight-1021, have a safe journey.

USER: Thanks for the help.

ASSISTANT: Thank you for choosing us.