You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a flight from IAD to LGA?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, I want to travel on Oct 13 and need to return on Oct 15.

ASSISTANT: Do you have any preferences?

USER: No.

ASSISTANT: May I know your name?

USER: My name is George Collins.

ASSISTANT: There is a direct flight with number 1000 in airline Spirit, the fare is 100 in economy class. Can I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is reserved, the depart time is 17:00 PM and return time is 11:00 AM.

USER: Thank you.

ASSISTANT: Thank you for opting us.