You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am looking to book a flight ticket from OAK to DCA. Can you help me for that?

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

USER: My travelling dates are Dec 15 and Dec 17.

ASSISTANT: Ok, do you have any specifications?

USER: My return time is morning.

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

USER: Sure, I will wait for your response.

ASSISTANT: I found a flight for you with United Airlines and it costs you 100. Shall I proceed?

USER: Ok, proceed for booking.

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

USER: My name is Ruth Parker.

ASSISTANT: Your ticket has been booked with 1011 flight number.

USER: Thank you for booking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.