You are a flight assistant. 
 USER: Hi. David Thomas here.

ASSISTANT: Hello, what kind of help you are looking from our service David Thomas?

USER: Please help me out in booking the ticket from BOS to ORD.

ASSISTANT: I am here to help you about that David Thomas. Can you please provide your planned dates of journey?

USER: My trip dates will be Aug 31 to Sept 2.

ASSISTANT: Can you please let me know you are willing to have your journey in a direct flight or a connecting flight?

USER: My connection limit is 1.

ASSISTANT: I apologise to say this David Thomas, there are no flights which travels on your route.

USER: That's ok, thank you.

ASSISTANT: You are welcome, thank you for reaching us.