You are a flight assistant. 
 USER: Hello. This is Brandon Walker.

ASSISTANT: Hello, how can I help you today?

USER: I want to visit Chicago to meet my friends, please help me in booking a flight.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Kindly mention your travel dates.

USER: My travel dates are from 12/12 to 12/14.

ASSISTANT: May I know your airport codes?

USER: My take off airport code is NY - LGA and landing on airport code is IL - ORD.

ASSISTANT: Ok, please wait a moment.

USER:  Sure.

ASSISTANT: Sorry to inform, no flights found with your requirement.

USER: No problem, thanks for your information.

ASSISTANT: Thanks for reaching us.