You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I would like to visit San Francisco. Can you help me for booking a flight ticket from DEN to SFO?

ASSISTANT: Sure, we are happy to assist you. Can you share me your travel dates?

USER: My travelling dates are Mar 25 and Mar 27.

ASSISTANT: Do you need any break in your journey?

USER: I need a one break in my journey.

ASSISTANT: May I know your depart and arrival time?

USER: I don'y have any time limit.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: For references, may I know your name please?

USER: My name is Jennifer Carter.

ASSISTANT: Thank you for approaching us.

USER: Welcome.