You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I want to book a flight ticket to attend a flower festival at DC-IAD from IL-ORD. Can you help me?

ASSISTANT: Sure, Please help me with your travel dates.

USER: 10/22 and 10/24 are my travelling dates.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: May I know your name?

USER: I am Joseph Brown.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for opting us.