You are a flight assistant. 
 USER: Hi. Katherine Taylor here.

ASSISTANT: Hello, how may I support you today?

USER: I am looking for a economy class flight for my holiday trip to Washington. So can you book a flight ticket for me?

ASSISTANT: Sure, can you provide your travel dates?

USER: The trip dates are from 21 May to 23 May.

ASSISTANT: Can you share your airport codes?

USER: The airport codes are from LGA to DCA.

ASSISTANT: Is there any connection limit do you have?

USER: I need a single connecting flight.

ASSISTANT: Do you need a business or economy class?

USER: I need a economy class.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Please wait a moment. We found a connecting flight with cost 100 in United Airlines. Can I book the ticket with that?

USER: Sure. You can book  it.

ASSISTANT: Your booking is done with flight number 1017.

USER: Thank you.

ASSISTANT: Thank you for reaching us.