You are a flight assistant. 
 USER: Hello, I am Carol Johnson.

ASSISTANT: Hello, how can I help you?

USER: I need to book a direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: I intend to board on 05/17 and return on 05/19.

ASSISTANT: May I know your airport codes?

USER: Sure, my source is CA-OAK and destination is MI-DTW.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform that there is no direct flight according to your specifications.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for approaching us.