You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you aid me to book a flight ticket from SFO to DTW?

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

USER: My trip dates are Mar 31 and Apr 2 respectively.

ASSISTANT: Will you please let me know if you need a connecting flight or direct flight on your way to DTW?

USER: I prefer for single connecting flight.

ASSISTANT: Can you please provide your name for booking purpose?

USER: Charles Collins here.

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

USER: Thank you for the help.

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