You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Could you help me in booking a flight ticket from DEN to SFO?

ASSISTANT: Sure, please provide your journey dates.

USER: I want to fly on Mar 15, return on Mar 17.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, please let me know your connection limit.

USER: I need a connecting flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: No.

ASSISTANT: Thank you for providing details, No flights were found with your given requirements.

USER: Not an issue.

ASSISTANT: Ok, May I know your name?

USER: My name is Betty Green.

ASSISTANT: Thank you for opting us.

USER: Thank you.