You are a flight assistant. 
 USER: Hello, Betty Lewis here.

ASSISTANT: Hello. How can I help you?

USER: I was thinking to travel from Austin to Washington.

ASSISTANT: Could you please provide your airport codes?

USER: Sure, they are AUS to DCA.

ASSISTANT: May I know your required dates?

USER: Sure, they are 06/30 to 07/02. Can you check a flight with 1 connection and price shall be 500 only.

ASSISTANT: Sorry Betty, there is no flight with your requirements.

USER: Ok, no problem from my side.

ASSISTANT: Thank you for choosing us.

USER: Thanks for service.

ASSISTANT: Have a nice day.