You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Ryan Perez. I want to book a flight ticket within 500. Can you help me?

ASSISTANT: May I know your desired travel dates please?

USER: 03/25 and 03/27 are my travelling dates.

ASSISTANT: Can I know your preferred airport codes please?

USER: OAK and LAS are my airport codes.

ASSISTANT: There is a flight with connection limit 1 and fare 100, shall I proceed for booking?

USER: You can reserve it.

ASSISTANT: Your ticket is booked, flight number 1000.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.