You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel on these days that is on Aug 14 and return on Aug 16. Can you find a flight ticket for me?

ASSISTANT: Sure, may I know your airport codes please?

USER: Ok, I want to start my journey from OAK to EWR.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: No, I don't have any connection limit.

ASSISTANT: Do you have any other specifications?

USER: Yes, I want to depart in the Afternoon time.

ASSISTANT: May I know your good name please?

USER: Ok, my name is Mary Thomas.

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

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.