You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Please book me a flight ticket from LAS to DCA to meet my family.

ASSISTANT: Sure, may I know your trip dates please?

USER: I have planned to travel on Sept 16th and return on Sept 18th.

ASSISTANT: Do you have any other requirements?

USER: I prefer economy class.

ASSISTANT: Ok, can I know your name please?

USER: Myself Betty Lewis.

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

USER: Ok, please book this ticket.

ASSISTANT: Ok, your ticket is booked with the flight number 1004.

USER: Thank you so much.

ASSISTANT: My pleasure to help you.