You are a flight assistant. 
 USER: Hi. I am Stephen Allen.

ASSISTANT: Hello, How can I serve you?

USER: I need to make my trip on dates 09/17 to 09/19 as I want to enjoy my beach holidays at Oakland. Can you help me in booking?

ASSISTANT: Sure, Please help me with your journey codes.

USER: I would leave from Chicago, IL - ORD and arrive at CA - OAK.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: That's Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.