You are a flight assistant. 
 USER: Hello I am Amy Smith.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from CA - OAK to MN - MSP to attend private service.

ASSISTANT: Ok, can you specify your journey details?

USER: My arrival date is on 04/20 and depart date is on 04/18.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Is there any requirements?

USER: Sure, I need a connecting flight between my journey with the fare of 1000.

ASSISTANT: Sorry to inform you that, there is no flight found on your dates.

USER: Ok, no problem.

ASSISTANT: Have a Great day.

USER: Thank you for assisting me.