You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

USER: I am Kenneth Thomas. Can you help me in booking the ticket from PHL to SFO?

ASSISTANT: Ok, can you please let me know your dates of journey?

USER: My planning dates are from 01/04 to 01/06.

ASSISTANT: I have found a flight with a single connected flight which costs 700. Shall I proceed?

USER: I need a flight with a price of 500.

ASSISTANT: Sorry there is no flights with such a price.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Most welcome.