You are a flight assistant. 
 USER: Hello, I am Karen Adams.

ASSISTANT: Hello, How can I assist you?

USER: I want to attend live sports event in DC - DCA. Help me with reservation.

ASSISTANT: Ok, May I know the travelling details?

USER: My depart is on 08/28 return on 08/30, origin CA - SFO, need with direct flight and price limit 1000.

ASSISTANT: Ok, Wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. Unfortunately, there are no flights found with your request.

USER: OK, no issues. Thank you, for the information.

ASSISTANT: Thanks for contacting us.