You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Eric Lee, want to travel from LGA to CLt. Please help me in ticket booking.

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 09/17 to 09/19.

ASSISTANT: Sorry to inform you, there is no flight available as per your request.

USER: That's fine, thank you.

ASSISTANT: Most welcome.