You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Justin Smith here. I would like to attend a business conference in Phoenix, can you please help me out with is there any flight for me to go there?

ASSISTANT: Yes, I can help you with that. Do you have any idea on the airport codes? If yes, please provide me the codes.

USER: Thank you for taking my request. Yes, I know your airport codes that I want to travel, I want to travel from DCA to PHX.

ASSISTANT: Ok, may I know your travelling dates to search for the flight?

USER: I am planning to leave my location on 11/21 and please book my return ticket also on 11/23.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok, take your time but try to bring a best flight in my route.

ASSISTANT: Ok, there is a flight 1009 in AA airline matching your details with price 100. Shall I proceed?

USER: That's fine for me, I am ok with this. You can proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you for your help in booking of my ticket.

ASSISTANT: You are welcome, have a safe journey.