You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a flight from Denver to meet my friend at New York. Can you book a flight for me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: I will travel on Apr 15 and return on Apr 17.

ASSISTANT: Please provide your airport codes.

USER: My source point is DEN and my destination is LGA.

ASSISTANT: Do you have any specifications about flight connections?

USER: I prefer a connecting flight.

ASSISTANT: Please mention your name.

USER: My name is Alexander Hernandez.

ASSISTANT: Do you have any specifications about class?

USER: No.

ASSISTANT: The Delta airlines providing an economy class flight with price 200 and the connections 1 is available. Shall I confirm your ticket?

USER: Please proceed with booking.

ASSISTANT: Your ticket is booked. The flight number is 1009.

USER: Thank you for helping me.

ASSISTANT: Welcome, have a great day.