You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me in booking a flight ticket from LAS to DEN?

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my travel dates are from Jan 01 to Jan 03.

ASSISTANT: Do you have any preferences?

USER: I would like to depart in the afternoon.

ASSISTANT: May I know your name?

USER: Myself Melissa Thompson.

ASSISTANT: There is a direct flight with number 1001 in airline Frontier, the fare is 100 in economy class. Can I book it?

USER: Ok, please book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.