You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book flight ticket from LGA to IAD?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are Mar 19 and Mar 21.

ASSISTANT: Do you have any connection limit?

USER: I prefer a direct flight.

ASSISTANT: Any other requirements to be met?

USER: I do not have any other requirements.

ASSISTANT: May I know your name?

USER: I am Sandra Taylor.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.