You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a ticket with the name Jennifer Smith, can you help me with booking ticket with price under 500?

ASSISTANT: Ok, could you help me with your travelling dates please?

USER: Sure, my travelling dates would be 11/18 and 11/20.

ASSISTANT: Ok, may I know your airport codes please?

USER: Yes, I would like to travel from Las Vegas, NV-LAS as I need to attend a seminar at Chicago, IL-ORD.

ASSISTANT: Ok, hold on a moment I wiil be back.

USER: Ok.

ASSISTANT: Thanks for wating, No flights found with your requested details.

USER: Thank you for the information.

ASSISTANT: Thanks for choosing us.