You are a flight assistant. 
 USER: Hi, I am Michelle Phillips.

ASSISTANT: Hello, how can I help you today?

USER: Could you help me in booking my flight ticket to Oakland CA-OAK to present my drawings in Art festival, please help me in booking from CO-DEN. I prefer a connection.

ASSISTANT: Sure, can you please share your travelling dates?

USER: My price should not exceed 500. My journey is from 05/26 to 05/28.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that we have not found any flights matching with your requested given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for choosing us.