You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Please book a flight ticket from OAK to DEN?

ASSISTANT: Sure, I will help you. Please help me with your planned travelling dates.

USER: My journey dates are May 04 and May 06.

ASSISTANT: Please help me with your name.

USER: I am Shirley Harris.

ASSISTANT: Do you need a break in between your journey?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No.

ASSISTANT: Please help me a minute.

USER: Sure.

ASSISTANT: Thank you. Shirley Harris, I am really sorry to inform you that there are no flights available for your journey.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for understanding. Thank you for reaching us. Have a great time.