You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Stephanie King.

ASSISTANT: How can I aid you?

USER: I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 500?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: I want to travel on 10/11, and need to catch return flight on 10/13.

ASSISTANT: Please share me your preferable airport codes.

USER: It is a round trip to Las Vegas, NV - LAS.

ASSISTANT: We found a Delta airline, flight number:1020 and the price is 100. Can I reserve it?

USER: It is perfect, please reserve my seat.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for your quick response.

ASSISTANT: Thank you for choosing us.