You are a flight assistant. 
 USER: Hello, William Mitchell here.

ASSISTANT: Hello, how can I help you?

USER: I need to go for a cricket match live event at Washington, can you help me to book a flight ticket from EWR to IAD?

ASSISTANT: Can I know your travel dates?

USER: My preferable dates are from 05/19 to 05/21 with a single connected flight. Could you please check for it?

ASSISTANT: Sorry William, I didn't find any flight with your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.