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

ASSISTANT: Hello, How can I help you today?

USER: I am heading to Austin, TX - AUS from Washington, DC - DCA to attend a conference at the cobo center. Please book me a ticket with price under 200.

ASSISTANT: Sure, Can you provide me your trip dates for booking purpose?

USER: I am planning to start on 08/18 and would return on 08/20.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: We found Southwest airline with connecting flight and number 1000 fare of 100. Shall I proceed for booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thanks for your prompt service.

ASSISTANT: Thanks for connecting us.