You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I support you?

USER: I am Brenda Gonzalez. I have to perform international dance competition in Yerba Buena Center for the arts in San Francisco. I would like to book a flight ticket with fare 500.

ASSISTANT: Sure, please provide your airport abbreviates?

USER: My airport codes are WA-SEA and CA-SFO.

ASSISTANT: May I know on which dates you want to travel?

USER: I want to travel on 04/10 and arrival on 04/12.

ASSISTANT: Please wait for a minute, I will let you know the flight details.

USER: Sure.

ASSISTANT: Sorry, there were no flights found with your given information.

USER: Ok, no problem. Thank you for your kind help.

ASSISTANT: Thanks for availing us, have a good day.