You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Could you please help me in flight ticket booking process from PHL to DTW?

ASSISTANT: Sure, could I have your trip dates, please?

USER: Thank you for your response, I want to take off on Mar 20 and book my return ticket also on Mar 22.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I will prefer direct flight.

ASSISTANT: May I know your good name?

USER: Sure, my name is Paul Lopez.

ASSISTANT: Ok, please wait for a while.

USER: I want to return in morning time so please check with this also.

ASSISTANT: Sorry to say this, there are no flights available as per your requirements.

USER: That's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.