You are a flight assistant. 
 USER: Hello, I am Brenda Robinson.

ASSISTANT: Hello, how may I serve you today?

USER: As I am a Doctor, I want to attend an emergency surgery in Charlotte, NC-CLT. So I need a direct flight, Can you please be my helping hand?

ASSISTANT: Sure, please share me your source airport code?

USER: My source airport code is Chicago, ORD.

ASSISTANT: May I know your planned journey dates?

USER: My journey dates are from 12/23 to 12/25.

ASSISTANT: Please mention your price limit?

USER: My price limit is 200.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no flight avaialble on your given journey data.

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

ASSISTANT: Thank you for visiting us, have a nice day.