You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am looking for a flight from OAK to DTW, can you help me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are 16 and 18 of Apr.

ASSISTANT: Thank you, do you have any limits on number of connections?

USER: I need a connecting flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: No.

ASSISTANT: May I know your name for the booking process?

USER: I am Raymond Scott.

ASSISTANT: Sorry, no flights are available on your planned dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Welcome, thank you for reaching us.