You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am looking to book a flight ticket from BOS to OAK. Can you help me for that?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are Aug 20 and Aug 22.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I prefer to book a single connecting flight.

ASSISTANT: Do you have any class preferences?

USER: Any class is fine for me.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Can you please provide your name to proceed further?

USER: My name is Mary Gonzalez.

ASSISTANT: Sorry, there are no flights available at your request.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Welcome.