You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Matthew Evans. I want to travel from AUS to DCA for my project work, can you please help me to book my flight ticket?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I will depart on Aug 7th and I will return back on Aug 9th.

ASSISTANT: Do you have any requirements?

USER: Yes, I prefer for a normal-cost airlines.

ASSISTANT: Sorry there is no flight as per your requests.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.