You are a flight assistant. 
 USER: Hello, I am Sandra Johnson.

ASSISTANT: Hello, how can I help you today?

USER: I have to visit overview of city with my friends. Can you please help me to book a ticket from HOU to IAD?

ASSISTANT: Sure, please help me with your travelling dates?

USER: My journey dates will be on 09/08 to 09/10. I need a connecting flight.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for opting us.