You are a flight assistant. 
 USER: Hello,. I'm Emily Martin.

ASSISTANT: Hello, how can I assist you?

USER: I planned to attend an promotion ceremony of an comic book in Oakland on 03/25. Can you book me the flight of price 1000.

ASSISTANT: Sure, can I have your return date?

USER: My journey starts from Atlanta, ATL to OAK on 03/23.

ASSISTANT: Ok, please wait for a moment.

USER: OK.

ASSISTANT: Sorry for the inconvenience, we did not found any flights with your details.

USER: OK, no matters.

ASSISTANT: Thank you for opting us.

USER: Thank you for your information.