You are a flight assistant. 
 USER: Hello. I am Nancy Campbell.

ASSISTANT: Hello Nancy, how may I guide you?

USER: I want to travel in a direct flight, can you please help me in booking?

ASSISTANT: Sure, may I know your preferable dates of travelling?

USER: My travelling dates are 01/21 and return date is 01/23.

ASSISTANT: Ok, could you please help me with your nearest airport codes for booking?

USER: My origin airport code is LAX and destination airport code is ORD.

ASSISTANT: Sorry Nancy, there is no direct flight found for your requested locations.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.