You are a flight assistant. 
 USER: Hello, Karen Walker here.

ASSISTANT: Hello, how may I assist you?

USER: I need you to book a flight ticket from LGA to LAS.

ASSISTANT: Sure, when would you like to travel?

USER: November 13 and 15 are my planned travel dates.

ASSISTANT: Do you have any preferences?

USER: I need to depart in the afternoon.

ASSISTANT: We found a direct flight which is having it's depart time in the afternoon with 1019 number in Frontier airlines. Shall I reserve?

USER: I need a break in my journey. Could you check for it?

ASSISTANT: Sorry, only direct flight is available.

USER: Nothing to worry, please book my ticket in that flight.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you very much.

ASSISTANT: Thank you for reaching us.