You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you aid me in booking flight ticket to reach OAK from DFW?

ASSISTANT: Sure, can I have your good name?

USER: I am Jessica Davis.

ASSISTANT: Can you provide your travel dates?

USER: My departure date is on Sept 12th and return is on Sept 14th.

ASSISTANT: Do you need a stopover?

USER: I prefer to travel in the direct flight.

ASSISTANT: Is there any other requirements for you?

USER: I would like to travel in business class.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight services available on your required dates.

USER: Ok, not a problem. Thank you for checking.

ASSISTANT: Thank you for opting us.