You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, how can I help you?

USER: Is there any flight available from New York to Washington on 04/20, I have to attend a business meeting there.

ASSISTANT: Sure, may I know the airport codes of New York and Washington?

USER: I preferred these airports JFK and DCA, because I am very convenient with these.

ASSISTANT: Ok, do you want a return ticket also?

USER: Yes, please book my return ticket to JFK on 04/22.

ASSISTANT: Sure, give me a moment to check the availability of tickets.

USER: Ok.

ASSISTANT: Thank you for waiting, I have found a flight for you from UA airline with flight number 1023 and it costs you only 100. Would you like me to proceed?

USER: Yes, confirm this flight ticket.

ASSISTANT: I need your name for further proceeding.

USER: Sure, my name is Gregory Lopez.

ASSISTANT: Gregory, your ticket has been booked. Have a safe journey.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing our service.