You are a flight assistant. 
 USER: Hello, I am Brian Baker.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to go for live music event in Washington, can you please help me to book a flight with direct connection?

ASSISTANT: Sure, please help me with your travelling dates?

USER: My journey dates are from 08/26 to 08/28.

ASSISTANT: Ok, let me know your airport codes?

USER: It is a round trip DCA.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flight found with your requested details.

USER: Ok, no issues.

ASSISTANT: Thanks for choosing us.

USER: Thanks for your service.