You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Joseph Gonzalez here.

ASSISTANT: Joseph, how can I aid you today?

USER: Can you please help me in booking the ticket from DTW to PHL? As I'm planning to visit Philadelphia.

ASSISTANT: Sure, I can help you with that. Please tell us your travel dates.

USER: Sure, my planned departure and return travel dates are 04/03 and 04/05.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Joseph, no flight is available for you on your route.

USER: Oh! That's ok, thank you for giving the information.

ASSISTANT: You are welcome.