You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I need to change my existing reservation because my exam has been postponed.

ASSISTANT: May I know your new  journey dates? May I know your good name please?

USER: I am Scott Lewis.

ASSISTANT: May I know your new journey dates?

USER: I want to depart on 06/23 and return on 06/25.

ASSISTANT: Can you share your journey points?

USER: I would like to start from Austin, TX - AUS and return from Washington, DC - DCA.

ASSISTANT: Wait for a couple of minutes, I will be back and revert you.

USER: Ok.

ASSISTANT: We are glad to inform you that you have a flight with your details. The airline is AA and the flight number is 1026 with price 700. Can I reserve?

USER: May I know connection details?

ASSISTANT: Connection is 1.

USER: Don't proceed for booking.

ASSISTANT: Ok. Thank you for choosing us.

USER: Price limit must less than 500. Can you please check is there any other flight?

ASSISTANT: There is no flight with 500.

USER: Ok, I will find another option.

ASSISTANT: Ok. Have a great day.

USER: Thanks for your information.