You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Can you please search a direct flight for me?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are 10/21 and 10/23.

ASSISTANT: May I know your travelling airport codes?

USER: My travelling airport codes are DTW to PHL.

ASSISTANT: May I know your name please?

USER: Ok, myself Charles Martin.

ASSISTANT: I am sorry no flights found on your dates.

USER: Ok, fine thank you for checking.