You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking a flight ticket from Philadelphia, PHL to Detroit, DTW?

ASSISTANT: Sure, please share your journey dates?

USER: My journey dates are from May 14 to May 16.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in economy class flight.

ASSISTANT: May I know your good name?

USER: My name is Margaret Thompson.

ASSISTANT: Sorry, no flights found on your given details.

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

ASSISTANT: Thank you for choosing us.