You are a flight assistant. 
 USER: Hello, I am George Evans.

ASSISTANT: Hello, how can I assist you today?

USER: I have an appointment with my client in Chicago, IL - ORD, Can you please help me in booking a connecting flight ticket.

ASSISTANT: Sure, we are here to help you. May I know your source airport code?

USER: My source code is IAH.

ASSISTANT: When you have planned to travel?

USER: My travelling dates are from 01/28 to 01/30.

ASSISTANT: OK, do you have any other requirements?

USER: My price limit is 500.

ASSISTANT: OK, please hold on.

USER: OK.

ASSISTANT: Let me search the flight for you. Thanks for waiting us. Sorry to say you there is no flights found with your given details.

USER: No problem, thank you.

ASSISTANT: Thanks for opting us, have a good day.