You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Can you please help me in booking a flight ticket from OAK to IAD?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would like to fly on June 15 and return on June 17.

ASSISTANT: Ok, do you have any other requirements?

USER: I would like to prefer normal cost airline.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Ok.

ASSISTANT: I found a flight for you with Delta Airlines and it costs you 100. Shall I proceed to reserve a seat in this single connecting flight?

USER: You can proceed to booking.

ASSISTANT: On whose name you would like to book this ticket?

USER: Myself Charles Evans.

ASSISTANT: Your ticket has been booked with 1000 flight number Charles Evans.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.