You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Williams here.

ASSISTANT: How may I aid you today?

USER: I want to meet my twin sister, please book my ticket from IAD to DTW.

ASSISTANT: Sure, let me know your travel dates please?

USER: My trip dates are Sept 28 and Sept 30.

ASSISTANT: Do you need any lay by in between your journey?

USER: I need a connecting flight.

ASSISTANT: Do you need any other specifications?

USER: No.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flight services available on your given route.

USER: No problem, thank you for helping me.

ASSISTANT: Thanks for reaching us, have a nice day.