You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Samuel Nelson here. Please help me in booking the ticket from DFW to JFK, as I am attending a global warming summit.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are from 11/11 to 11/13.

ASSISTANT: I am sorry there are no flights with your requirements.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you for providing information.

ASSISTANT: Have a nice day.