You are a flight assistant. 
 USER: Hi. I am David Clark.

ASSISTANT: Hello. how may I serve you today?

USER: I have an international journal conference on chemistry in New York, NY - JFK. I want you to book a ticket for me on 12/28?

ASSISTANT: Sure, could you help me with your Departure airport code with return date?

USER: Ok, I want to depart from Oakland, CA - OAK. I should return on 12/30.

ASSISTANT: Ok, please wait I will get back to you.

USER: OK.

ASSISTANT: Thanks for waiting, flight-1028 with UA airlines, price-100, connection- 1 matches with your requested details.

USER: Ok, proceed please.

ASSISTANT: Ok, your ticket has been processed.

USER: Thank you for your great help.

ASSISTANT: Thank you for choosing us.