You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: I am Patricia Martin. Can you please help me to book a ticket from LAS - CLT?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: I would like to start my journey on 07/09 and return on 07/11.

ASSISTANT: Do you have any preferences?

USER: My price limit is 500.

ASSISTANT: Thanks for your details. There are no flights found on your data.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.