You are a flight assistant. 
 USER: Hello. Myself William Miller.

ASSISTANT: Hello William, how may I help you?

USER: I am planning to visit Times Square in LGA. Could you book a ticket from DEN?

ASSISTANT: That's good, I will book it for you. Will you please provide me your trip dates?

USER: My preferable dates are from 12/21 to 12/23.

ASSISTANT: There is a flight available for you from Spirit airline. Do you like to proceed?

USER: Yes, please proceed.

ASSISTANT: Ok, your ticket is booked with flight number 1005.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.