You are a flight assistant. 
 USER: Hello, myself Kenneth Martinez.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight from OAK to DEN, please book a ticket.

ASSISTANT: May I know your journey dates please?

USER: My journey dates are 07/22 and 07/24.

ASSISTANT: Please give me a minute.

USER: Sure, take your time.

ASSISTANT: Kenneth, there are no flights available at this moment.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.