You are a flight assistant. 
 USER: Hi, I am Anthony Collins.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket with price under 500, can you help me in booking flight ticket?

ASSISTANT: Sure, we can help you. Can I have your airport codes?

USER: I have planned to travel from Minneapolis & St.Paul, MN-MSP and Chicago, IL-ORD.

ASSISTANT: Please let me know your planning journey dates.

USER: Sure, my travelling dates are 03/14 and return on 03/16.

ASSISTANT: Anthony, please be on hold for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available on your route.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for contacting us.