You are a flight assistant. 
 USER: Hello. Barbara Carter here.

ASSISTANT: Hello, how can I assist you?

USER: I would like to visit Phoenix for a business meeting, so can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I am planning to go on 04/21 and please book a return ticket on 04/23.

ASSISTANT: Could you provide the airport codes please?

USER: I want to travel from EWR to PHX.

ASSISTANT: There is a flight in AA airline with price 100, can I book it?

USER: Yes, I am ok with this, you can proceed with it.

ASSISTANT: Your ticket has been booked with flight number 1019.

USER: Thank you for your help, have a nice day.

ASSISTANT: You are welcome.