You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Could you help me in booking a flight ticket from IAD to LAS?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on Sept 25, return on Sept 27.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Ok, let me know your name please.

USER: My name is Mary Allen.

ASSISTANT: Please wait for some while.

USER: Sure.

ASSISTANT: Thank you for waiting and we have found a flight in economy class with 1 connection in American airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: Ok, proceed to booking.

ASSISTANT: Ok, your ticket is booked with the flight number 1001.

USER: Thank you.

ASSISTANT: Most welcome.