You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Can you help me to book a flight ticket from CA - OAK to WA - SEA. So I can visit the art park, can you aid me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for responding positively.

ASSISTANT: Can you please mention your preferable travel dates for booking flight ticket?

USER: Ok, please book the flight ticket on the date 08/25 and return dates is 08/27.

ASSISTANT: May I know your name for further process?

USER: Ok, my name is Mary Edwards.

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

USER: Ok, I will wait.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: Ok, not a problem. Thank you for assisting me.

ASSISTANT: Thank you for contacting us, have a good day.