You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Catherine Wilson. I want to attend an emergency surgery at Chicago, IL-ORD, can you please book me a ticket for direct flight?

ASSISTANT: Sure, I am happy to help you. Can you please provide me your source code?

USER: My source code is Dallas, TX-DFW.

ASSISTANT: When your willing to travel?

USER: My travel dates are from 08/14 to 08/16.

ASSISTANT: Thanks for your details, there is no flight found on your routes.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.