You are a flight assistant. 
 USER: Hello, I am Mary Baker.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a ticket from DTW to OAK?

ASSISTANT: Sure, I will help you. Please wait for a moment, I will check the availability.

USER: I would like to go on 02/03 and return back on 02/05.

ASSISTANT: Noted.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flights available on your dates of journey.