You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am George Hill. Can you please book a flight ticket from OAK to ORD?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Sure, I need to travel on dates of 03/18 and 03/20.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Oh! It's ok fine, no problem. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.