You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I planned to meet my friend in LGA, can you please help me to book a flight ticket from LAS?

ASSISTANT: Can I know your travelling dates?

USER: I prefer to travel on Nov 1 and Nov 3.

ASSISTANT: Let me know your name?

USER: I am Karen King.

ASSISTANT: Do you have any preference?

USER: I prefer to travel in economy class.

ASSISTANT: Connecting flight can be booked with airline Delta for price 300 having flight number 1020.

USER: Ok, please confirm my booking.

ASSISTANT: Ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.