You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Roberts here.

ASSISTANT: How can I assist you?

USER: ABN AMRO bank is one of the largest bank in Chicago and I work there as a chartered accountant. I am flying there to Chicago ORD on 07/25. My depart date will be from OAK on 07/23.

ASSISTANT: Oh! that's great, thank you for providing your details. I am sorry there are no flights with your details.

USER: Ok, it is not a problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.