You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that I can do for you?

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

ASSISTANT: Sure, on what dates that you have planned your journey?

USER: I would like to travel on 02/15 and return back on 02/17.

ASSISTANT: Please be on hold for a moment.

USER: Sure.

ASSISTANT: I am sorry to say that, there are no flights that are moving on your dates to book the tickets.

USER: That's fine. Thank you for your service.

ASSISTANT: You are most welcome and thank you for reaching us.