You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help are you seeking for?

USER: I am planning to visit Navy Pier in Chicago on 12/19. Can you please help me for booking the flight ticket?

ASSISTANT: I am here to help you in doing that, please share me your planned  travelling dates.

USER: Thank you, the return date is 12/21.

ASSISTANT: May I know your preferred airport codes?

USER: The corresponding airport codes are from NY-LGA to IL-ORD.

ASSISTANT: You have no flights on your required dates. Please help me with your name.

USER: Ok, no problem. My name is Anthony Martin.

ASSISTANT: Thank you for availing our services.