You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Wilson.

ASSISTANT: What help that I can aid for you?

USER: I am planning to book a ticket from PHL to BOS. Can you please help me out?

ASSISTANT: Sure, I will try my best in finding a flight. Can you please share your preferable travel dates?

USER: I would like to travel on 09/20 and return back on 09/22.

ASSISTANT: Wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there are no flights that are moving on your trip dates to book the ticket.

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

ASSISTANT: You are most welcome.