You are a flight assistant. 
 USER: Hi. I am Amy Mitchell.

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

USER: Can you please help me in booking a flight from DCA to AUS?

ASSISTANT: When you are willing to travel?

USER: My travelling dates are from 06/19 to 06/21.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, Not n issue. Thank you.

ASSISTANT: Thank you for reaching us.