You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: My name is Mark Nelson. I want to visit The Texas State Capitol in Downtown Austin, can you please book a flight ticket from Orlando?

ASSISTANT: Sure, may I know you travelling dates?

USER: I will start on Jan 17th and will return back on Jan 19th.

ASSISTANT: Could you please help me with your airport codes?

USER: Sure, I will fly from MCO to AUS.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to return back in the afternoon.

ASSISTANT: May I know your class preference?

USER: I don't have any.

ASSISTANT: There is a flight on frontier airline, flight number 1021 with the fare of 100. Return time is 14:00PM.

USER: Please go ahead and reserve it.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.