You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from PHL to LAX?

ASSISTANT: Sure, let me know your travelling dates.

USER: My journey dates are from Apr 15 to Apr 17.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is John Allen.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us.