You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Kathleen Hill. Can you please help me in booking my flight ticket from DFW to SFO?

ASSISTANT: Sure, please share your travelling dates?

USER: My travelling dates are 07/26 and 07/28.

ASSISTANT: Ok, any other requirements to be met?

USER: I need single connection flight.

ASSISTANT: Ok, no flights found with your requested details.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for opting us.