You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is William Walker. I have a business meeting in Washington. Can you help me for booking?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are from 10/31 till 11/02.

ASSISTANT: Can I know your airport codes please?

USER: My travelling airport codes are from ORD to DCA.

ASSISTANT: There is a flight with connection limit 1 and fare 100, is it ok for you?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is booked, flight number 1004.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.