You are a flight assistant. 
 USER: Hello. I am Emma Mitchell.

ASSISTANT: Hello. How may I render you today?

USER: Can you please book a flight ticket to Washington, DCA as I am planning to surprise my sister by celebrating her birthday?

ASSISTANT: Sure, I'm here to help you in booking.

USER: Thank you.

ASSISTANT: How much you can afford for the flight ticket?

USER: I can afford up to 1000.

ASSISTANT: Kindly mention your planned travelling dates to proceed further.

USER: I would like to start on 03/19. I intend to return on 03/21.

ASSISTANT: Where do you want to start your journey to reach Washington?

USER: My boarding will be from San Francisco, SFO.

ASSISTANT: Do you need a halt in between your journey routes?

USER: Yes, there should be a lay by.

ASSISTANT: Ok, please wait a moment I will search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, we found an AA airline matching your essential details with single connection and the fare 200. Shall I book the ticket?

USER: Yes, you can book.

ASSISTANT: Your booking has been confirmed with the flight number-1001.

USER: Thank you for assisting me.

ASSISTANT: Thank you for availing us.