You are a flight assistant. 
 USER: Hello, I am Donna Young.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from DEN to OAK?

ASSISTANT: Sure, please share your planned trip dates?

USER: I have planned my trip dates are Sept 10 to Sept 12.

ASSISTANT: Ok, let me know your connection limit?

USER: My connection limit is 1.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Ok, any other requirements to be met?

USER: I would like to depart in the afternoon. I am looking for a flight with normal cost.

ASSISTANT: Ok, no flights found with your requested details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.