You are a flight assistant. 
 USER: Hello, I am Katherine Robinson.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from BOS to SFO?

ASSISTANT: Sure, please share your planned trip dates?

USER: My travelling dates are July 16 to July 18.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.