You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book a flight from LAS to LGA?

ASSISTANT: Could you provide your travelling dates.

USER: Sure, I want to travel on Mar 22 and need to return on Mar 24.

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Do you have prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am Brian Nelson.

ASSISTANT: Is there any preference?

USER: No.

ASSISTANT: Direct flight is found with United airlines for price 100.

USER: Ok, please proceed.

ASSISTANT: Ticket is booked having flight number 1015.

USER: Thank you.

ASSISTANT: Thank you.