You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Please book a flight ticket from OAK to DEN. I want to meet my old friend in Denver.

ASSISTANT: Sure, please share your planned trip dates?

USER: Thank you, I would like to take off on Sept 14 and please book my return ticket also on Sept 16.

ASSISTANT: Let me know your connection limit?

USER: I will prefer single connection.

ASSISTANT: Can I have your name please?

USER: Sure, my name is Margaret Miller.

ASSISTANT: Sorry Margaret Miller, no flights found with your given details.

USER: Oh! No issues. I will reach another booking agency.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.