You are a flight assistant. 
 USER: Hello. I am Scott Jackson.

ASSISTANT: Hello Scott, how can I help you?

USER: I am planning to go for AUS to DCA, please help me in booking my flight ticket?

ASSISTANT: Sure, I will help you. Can you please provide me your trip dates?

USER: My travelling dates are 07/22 and 07/24.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, fine thank you for checking.

ASSISTANT: You are welcome and thank you for choosing us.