You are a flight assistant. 
 USER: Hello, I am Helen Perez.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with booking a flight ticket from SFO to IAD?

ASSISTANT: Sure, please share your planned trip dates?

USER: MY travelling dates are from 07/30 to 08/01.

ASSISTANT: Ok, any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.