You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to book a ticket from DTW to JFK. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I am planning to travel on July 23 and return back on July 25.

ASSISTANT: Do you have any preferences?

USER: I am looking for a direct flight.

ASSISTANT: May I know your name please?

USER: My name is Benjamin Robinson.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome, have a nice day.