You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you aid me to book a flight ticket for the dates Aug 22 and Aug 24 respectively?

ASSISTANT: Sure, can you please help me with your name?

USER: My name is Brandon Jackson.

ASSISTANT: May I know your source and destination airport codes?

USER: Ok, please check for the flight from my source airport CLT and destination is DCA.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: I am sorry, there is no flight available on your preferred travel dates.

USER: That is ok, thank you for assisting me.

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