You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to visit my brother marriage at Orlando, can you please help me to book a flight ticket from IAD to MCO?

ASSISTANT: May I know your trip dates?

USER: Sure, my travelling dates are Nov 17 and Nov 19.

ASSISTANT: Please share your name?

USER: My name is Samantha Collins.

ASSISTANT: Do you prefer any specifications?

USER: I need a direct flight.

ASSISTANT: We found a direct flight in Frontier airlines with the fare 100 in economy class.

USER: Ok, please book.

ASSISTANT: Your booking is done.

USER: Thank you for your help.

ASSISTANT: Thank you.