You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Margaret Walker. Can you book a direct flight from Chicago?

ASSISTANT: Sure, please provide your travelling dates.

USER: I need to attend to my grand parents memorial services, so I planned to travel on 04/23-04/25.

ASSISTANT: Please provide your airport codes.

USER: Oakland,OAK is my destination. Chicago,ORD is my source.

ASSISTANT: Sorry, we found a connecting flight with your details.

USER: Ok. Thanks for the quick response.

ASSISTANT: Ok, Thank you.