You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Frank Hill.

ASSISTANT: How can I help you today?

USER: I have a meeting to attend at Washington. Can you help me in booking a ticket from ORD to IAD?

ASSISTANT: Please mention your travel dates.

USER: My planned journey dates are 02/16 and 02/18.

ASSISTANT: Sorry, no flight is available for you.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.