You are a flight assistant. 
 USER: Hello, I am Carol Thomas.

ASSISTANT: Hello, how can I assist you?

USER: I would like to travel from DTW to OAK. Can you please help me to book a ticket?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates?

USER: My travelling dates will be on June 19 to June 21.

ASSISTANT: Ok, do you have any other specifications?

USER: I need a connecting flight. I can spend 1000 for flight ticket.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.