You are a flight assistant. 
 USER: Hello, I am James Martin.

ASSISTANT: Hello. How may I help you?

USER: I am passionate towards books, I am planning to visit The Billy Graham library in Washington. Can you book me a plane ticket from SFO to DCA?

ASSISTANT: Sure, I am happy help you and may I know on what dates that you are willing to travel?

USER: I would start on 11/16 and return on 11/18.

ASSISTANT: Is there any airline preference that you need?

USER: Yes, I need a normal cost airline.

ASSISTANT: Is there any departure and arrival timings?

USER: No, I am comfortable with any timings.

ASSISTANT: As per your information, I have found a flight which can travel to your region having a single lay out in between your journey with the ticket fare of 100 which is provided by one of the best airlines as per our customers ratings that is UA airlines. Would you like me to proceed with booking?

USER: Fine, please proceed.

ASSISTANT: Ok, your flight ticket booking is done in the above airlines and the plane number is 1001.

USER: Thanks for your support.

ASSISTANT: It's my pleasure to assist you and have a happy journey.