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

ASSISTANT: Hello, how may I help you?

USER: I would like to visit New York for tourism. Can you help me in booking a ticket from DEN to LGA?

ASSISTANT: Sure, please provide your trip dates.

USER: My preferred journey dates are 11/05 and 11/07.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Thank you for your waiting, I found a flight for you in UA airlines with price 100. Can I proceed?

USER: Please book the ticket.

ASSISTANT: Ok, your ticket has been booked with flight number 1008.

USER: Ok, thank you for your service.

ASSISTANT: Thank you for reaching us.