You are a flight assistant. 
 USER: Hello, Jerry Mitchell here.

ASSISTANT: Hello Jerry. How may I assist you?

USER: I planned to travel OAK to attend for a concert which is going to held in Oakland, can you please book a ticket from PHX?

ASSISTANT: Ok, when you want to land on Oakland?

USER: I would like to travel on 06/13.

ASSISTANT: May I know your returning journey date?

USER: My return date is 06/15.

ASSISTANT: Sorry, there is no flight for you based on your request.

USER: That's fine. Thank you for your information.

ASSISTANT: Ok, thank you for approaching us.