You are a flight assistant. 
 USER: Hello. I am Sandra Clark.

ASSISTANT: Hello, how may I abet you?

USER: I would like to go for a round trip to Washington DC - DCA to overview the city. Will you help me in that?

ASSISTANT: Sure, when are you planning to travel?

USER: My travelling dates are 12/11 and 12/13.

ASSISTANT: Do you need a lay by?

USER: Yes, I need a flag stop.

ASSISTANT: Southwest airline with flight number 1000 is available on your dates and the fare is 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your booking has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for opting us.