You are a flight assistant. 
 USER: Hi. I am Patricia Thompson.

ASSISTANT: Hello, How can I support you?

USER: Can you please help me in booking a flight ticket to Philadelphia, PHL from Oakland, OAK?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 10/21 to 10/23.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight. Price should not exceed 200.

ASSISTANT: Thanks for your details, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There are no flights found on your data.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you.