You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I planned to meet my friend in DTW, can you please help me to book a flight ticket flight from OAK?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I prefer to travel on Oct 25 and Oct 27.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Jonathan Taylor.

ASSISTANT: Jonathan Taylor, there are no flight services are available on this route on your provided dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.