You are a flight assistant. 
 USER: Hello, I am Michael Mitchell.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please assist me in booking a flight ticket from DC-IAD to reach NY-JFK?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: My travelling dates are from Nov 18 to Nov 20.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.