You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Anthony Baker here, can you help me to book a flight ticket from CA - OAK to CO - DEN?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: Ok, please book for the date 02/14 and return date is 02/16.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Ok, please take your time.

ASSISTANT: Sorry to inform you, currently no flights are running at that location.

USER: That is ok, thank you for assisting me.

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