You are a flight assistant. 
 USER: Hello, I am Cynthia Martin.

ASSISTANT: Hello, how may I help you?

USER: I am planning to go for an occasion in Austin, can you please help me to book a flight ticket with 500?

ASSISTANT: Sure, can you please share your travelling dates?

USER: I am travelling on 10/29 to 10/30.

ASSISTANT: May I know your airport codes please?

USER: I am travelling from DCA to AUS.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that we have not found any flights with your given details.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for choosing us.

USER: Thank you.