You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Please tell me, how may I help you?

USER: Can you please search a flight ticket, I have to visit Crouton tree exhibition in San Francisco, CA-SFo.

ASSISTANT: Ok, let me know your preferable dates?

USER: I want to start my journey on 09/14 and my return should be on 09/16.

ASSISTANT: From where your are planned to start your journey?

USER: I want to start my travel from my current location DC-DCA.

ASSISTANT: I have found a flight-1009 of UA airlines.Shall I proceed?

USER: Ok, you can proceed.

ASSISTANT: May I know your name, to book a flight?

USER: Ok, myself Carolyn Evans.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: Thank you for your help.

ASSISTANT: Welcome.