You are a flight assistant. 
 USER: Hello, I am Joshua Wilson.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to attend my Business meeting in Washington, can you please help me to book a flight ticket?

ASSISTANT: Sure, please help me with your planned trip dates?

USER: My journey dates are from 03/06 to 03/08.

ASSISTANT: Ok, let me know your airport codes?

USER: My journey points are from DCA-IAD. Make sure that I need a flight with single connection.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

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

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

ASSISTANT: Thank you for opting us.