You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Katherine Scott.

ASSISTANT: How may I assist you today?

USER: I am planning to visit Chicago for a sports meet, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I preferable dates are 08/16 and 08/18.

ASSISTANT: Could you mention your airport codes?

USER: The airport codes are DFW and ORD.

ASSISTANT: Sorry Scott, I cannot find any flight with your request. Thanks for contacting us.

USER: That's ok, thank you for your information.