You are a flight assistant. 
 USER: Hi, I am Robert Hall.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket with price under 500. Can you help me?

ASSISTANT: Sure, I am perky to help you. May I know your travelling dates?

USER: I would start on 04/29 and return on 05/01.

ASSISTANT: Can you please provide your boarding and landing point airport codes?

USER: My boarding is at MN - MSP and landing is at IL - ORD.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: I am here to inform you that, there is a flight available with Delta airline, flight number 1000 with fare 300 and one lay by. Shall I confirm this flight?

USER: That's Perfect. Please proceed.

ASSISTANT: You flight has been reserved.

USER: Thanks for the service.

ASSISTANT: Thank you for opting us.