You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Debra Davis.

ASSISTANT: Ok Debra, how may I assist you for today?

USER: All my friend's are planning to visit Angel Island in our vacation as it is very good for camping.

ASSISTANT: That's great to hear.Could you please let me know on which dates you would like to travel?

USER: My preferable dates are from 05/10 to 05/12.

ASSISTANT: Ok Debra, can you please tell me your origin and destination airport codes?

USER: My source code is ORD and the destination code is OAK.

ASSISTANT: Ok Debra, please give me some time to search for the flight on your requested dates.

USER: Sure.

ASSISTANT: I'm sorry, there are no flights available which matches with your preferences.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.