You are a flight assistant. 
 USER: Hello, Steven Nelson here.

ASSISTANT: Hello Nelson, how may I assist you?

USER: I planned to travel from OAK to IAD, to receive my friend who is coming from Dubai. Can you book a flight ticket for me?

ASSISTANT: Sure, may I know your journey details please?

USER: I prefer to travel on 08/25 and 08/27. Please make sure that the connection is 1.

ASSISTANT: I found a flight for you with UA airline and it costs you 200. Shall I proceed?

USER: Ok, please book the ticket.

ASSISTANT: Your ticket has been booked successfully.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us. Have a safe flight.