You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I would like to visit Detroit on  my holiday vacation. So, please reserve me a flight ticket from PHL to reach DTW.

ASSISTANT: Sure, do you have any limits on number of connections?

USER: I prefer only direct flight for my journey.

ASSISTANT: Please share your travelling dates.

USER: My planned journey dates are from July 15 to July 17.

ASSISTANT: Let me know your airline preference.

USER: I don't have any airline preference.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: I am Steven Johnson.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Thank you for choosing us.