You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I want to go to San Francisco on 10/06. Can you check the availability of flight ticket?

ASSISTANT:  Sure, Do you have any connection limit?

USER: I need one connection.

ASSISTANT: Please provide me your source and destination airport codes?

USER: My airport codes are from CA-OAK to CA-SFO.

ASSISTANT: May I know your return date?

USER: I intend to return on 10/08.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: May I know your name?

USER: I am Paul Hernandez.

ASSISTANT: Thank you for choosing us.