You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Young.

ASSISTANT: How can I help you?

USER: I am planning to visit Oakland, OAK. Can you please book me a ticket from Washington, DCA?

ASSISTANT: Sure, may I know your journey dates please?

USER: My planned dates of journey are from 06/16 to 06/18.

ASSISTANT: AA airlines is having a flight with travel charge of 100, shall I proceed for booking?

USER: Please reserve my ticket with AA airlines.

ASSISTANT: Your ticket has been booked with flight-1027, have a safe journey.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for choosing us.