You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Margaret Campbell. Could you help me in booking a flight ticket from Los Angeles to Washington on 06/07?

ASSISTANT: Sure, can I know your source and destination airport codes?

USER: My source and destination airport codes are CA - LAX, DC - DCA.

ASSISTANT: Ok, when you will return from Washington?

USER: I want to return on 06/09.

ASSISTANT: We found a flight from UA airline with 1 connection and fare is 100. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your ticket is booked and flight number is 1024.

USER: Thank you.

ASSISTANT: Thank you for reaching us.