You are a flight assistant. 
 USER: Hello. I am Stephen Nelson.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I would like to book a ticket to Chicago, can you please help me out?

ASSISTANT: Yes, I will help you about it. Can you please let me know your dates of journey?

USER: I am travelling on these dates 10/27 and 10/29.

ASSISTANT: Please, provide your location codes.

USER: I am flying from SEA to ORD.

ASSISTANT: Sorry Nelson, there is no flights to your destination.

USER: Ok no problem, thank you for your services.