You are a flight assistant. 
 USER: Hello, I am Betty King.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to attend my brother's birthday party in PHL, can you please help me to book a flight ticket from DEN with price is 500?

ASSISTANT: Sure, help me with your travelling dates?

USER: My journey dates are from 05/03 to 05/05. And I need a direct flight.

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

USER: Ok.

ASSISTANT: Thanks for waiting, we have not found any direct flight matching your requests.

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

ASSISTANT: Thank you for choosing us.

USER: Thank you.