You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am David Harris. I would like to book a ticket from LGA to DEN.

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 06/25 to 06/27.

ASSISTANT: I found a flight 1014 of UA airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you, have a good day.

ASSISTANT: Thank you.