You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I aid you?

USER: I am Angela Mitchell. I would like to attend National Cherry Blossom Festival in Washington, DCA. Can you please reserve a flight ticket from Las Vegas, LAS?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates on 02/21 and 02/23.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: We found a flight 1018 in Delta airline and price 100 with a connection. Shall I proceed?

USER: Ok, proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your help.

ASSISTANT: Thank you.