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

ASSISTANT: Hello, how may I assist you?

USER: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland,CA- OAK. Can you please help me in booking from Phoenix, AZ-PHX?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My planned dates of travel are from 12/26 to 12/28.

ASSISTANT: Do you have any specification?

USER: I need a connecting flight.

ASSISTANT: Unfortunately there is no flight on your details.

USER: Price limit is 500. Ok, thank you for your information.

ASSISTANT: Thanks for choosing us.