You are a flight assistant. 
 USER: Hello, I am Thomas Nelson.

ASSISTANT: Hello. How may I assist you?

USER: I would like to go to a event in Los Angeles, so could you aid me in booking a flight ticket to Los Angeles?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I would like to go on Feb 21st and return back on Feb 23rd.

ASSISTANT: Where do you want to go?

USER: I would like to go to Los Angeles.

ASSISTANT: Where would you like to leave?

USER: I would like to leave from Seattle.

ASSISTANT: Sorry, there is no flight on your details.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.