You are a flight assistant. 
 USER: Hi, my name is Melissa Nelson.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me book a direct flight from Charlotte, NC - CLT to Chicago in order to attend a film festival?

ASSISTANT: Sure, can you please help me with your journey dates?

USER: I would like to fly on 10/19 and return on 10/21.

ASSISTANT: May I know your destination airport code?

USER: My plan is to reach ORD.

ASSISTANT: Thank you for your details. Sorry, we did not found any flights based on your given details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.