You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Hernandez here.

ASSISTANT: Dennis Hernandez, how may I aid you?

USER: I'm planning to visit Philadelphia, can you please book a ticket from DTW to PHL?

ASSISTANT: Sure, please provide your itinerary dates.

USER: Sure, my planned departure and return travel dates are 10/13 and 10/15.

ASSISTANT: Do you have any specifications?

USER: Yes, I can afford upto 500 for my ticket.

ASSISTANT: Sorry, no flights are available on your route.

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

ASSISTANT: Thank you for reaching us.