You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Sarah Phillips. I want to book a flight ticket from DCA to LGA. Could you help me in booking?

ASSISTANT: Sure, please share your planned trip dates?

USER: My travelling dates are from 02/26 to 02/28.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a halt.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.