You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: My name is Stephen Taylor . Can you please help me in booking the flight ticket from OAK to LAS?

ASSISTANT: Sure, May I know the journey dates?

USER: My travel dates are 07/20 and 07/22.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any preference in departure and arrival times?

USER: I would like to return in the afternoon.

ASSISTANT: Do you have any other requirements?

USER: I need a single connection flight.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for availing us.