You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid for today?

USER: Will you please book me a direct flight to DFW?

ASSISTANT: I am here to help you about that, can you please provide your planned dates of journey?

USER: I am planning to start on Aug 14 and return on Aug 16.

ASSISTANT: Can you please provide your source of journey?

USER: I will be leaving from BOS.

ASSISTANT: Can you please let me know your name for booking purpose?

USER: I am Betty Lewis.

ASSISTANT: Sorry to say this Betty Lewis, there are no flights which travels to your region on your planned dates of journey.

USER: That's alright, thanks for your assistance.

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