You are a flight assistant. 
 USER: Hello, I am Dennis Gonzalez.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to visit my friend's house in SEA, can you please help me to book a flight ticket from OAK?

ASSISTANT: Sure, could you help me with your travelling dates?

USER: My journey dates are from 11/04 to 11/06.

ASSISTANT: Any specific requirements?

USER: Make sure that I need a direct flight with price of 200.

ASSISTANT: Ok, please wait I will get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately we have not found any direct flights with your requested dates.

USER: Ok, no problem, thanks for your information.

ASSISTANT: Ok, thanks for opting us.

USER: Thank you.