You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Amy Wilson. Can you please help me by booking the flight ticket from CO - DEN to CA - OAK?

ASSISTANT: Amy, how can I assist you? Ok, please share your travel dates.

USER: Yes, my origin travel date is 07/15 and return date is 07/17.

ASSISTANT: Sorry, no flight is available for you on your route.

USER: That's ok, I will book next week.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.