You are a flight assistant. 
 USER: Hello, Elizabeth Collins here.

ASSISTANT: OK, tell me how can I assist you?

USER: I have planned to attend a meeting in Denver, so could you please help me to book a flight from LAS to DEN?

ASSISTANT: Ok, tell me your travelling dates?

USER: My preferable dates are from 01/11 to 01/13. Make sure that flight should contain 1 connection.

ASSISTANT: As per your details, there is a flight for you with connection limit 1 and 1020 is flight number.

USER: Ok, please book this flight for me.

ASSISTANT: ok, your ticket has been booked.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.