You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Michael Wilson, can you help me to book a normal cost airlines from DCA?

ASSISTANT: Sure, May I know your Destination airport code please?

USER: My preferred destination airport code is AUS.

ASSISTANT: Ok, may I know travelling dates of journey please?

USER: My journey dates are Sept 12 and 14.

ASSISTANT: Ok, may I know your class preference please?

USER: No, I want to return at afternoon from AUS.

ASSISTANT: Do you a need connecting flight?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: No issues, thank you for your quick response.

ASSISTANT: You are welcome.