You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Anna Turner. Can you book a flight ticket from DTW to OAK?

ASSISTANT: May I know your travelling dates, please?

USER: My travelling dates are from Dec 29 to Dec 31.

ASSISTANT: May I know your specifications?

USER: I want to depart in the morning time.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching our service.