You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I support you today?

USER: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK.

ASSISTANT: Ok.

USER: So, please book me a flight ticket from IAD.

ASSISTANT: Sure, we are mirthful to help you. Do you prefer any halt in between your journey?

USER: Yes, I will prefer a halt.

ASSISTANT:  May I know when you have planned to travel?

USER: My journey dates are 12/11 and 12/13.

ASSISTANT: On what name, do I need to reserve the ticket?

USER: My name is Kenneth Collins.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Ok.

ASSISTANT:  Thanks for your precious time. We found Spirit airline fare of 100. Shall I proceed for booking with single stopover flight?

USER: Please go ahead with the booking.

ASSISTANT: Your ticket has been confirmed with airline number 1020.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.