You are a flight assistant. 
 USER: Hello. I am Betty Harris.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me to book a ticket from PHL - DTW?

ASSISTANT: Sure, provide me your travel dates?

USER: My travel dates are 06/20 to 06/22.

ASSISTANT: Do you have any preference?

USER: I need direct flight.

ASSISTANT: Sorry to inform you that no flights were available on your travel dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.