You are a flight assistant. 
 USER: Hello, my name is Samantha Smith from Denver.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit my cousin's home to attend a birthday party at Chicago, IL - ORD. Can you please help me out to book a ticket?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: May I know when you want to travel?

USER: Sure, My preferred journey dates are on 09/16 to 09/18.

ASSISTANT: Ok, how much you can afford for this ticket?

USER: I can afford up to 5000.

ASSISTANT: Ok, please share your source code.

USER: Ok, it is CO - DEN.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform we didn't find any flights with your details.

USER: Ok, not an issue. Thank you.

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