You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: I am David Williams. Can you book a flight from LGA to DFW, because I have to meet my MD to discuss about company.

ASSISTANT: Sure, please provide your travelling dates.

USER: I need a direct flight. My travel dates are 09/10 to 09/12. But the price can be 5000.

ASSISTANT: Ok, thanks for providing the details. Please wait for a while.

USER: Sure.

ASSISTANT: Ok, not an issue. Thanks for your service. Sorry for the inconvenience, there is no flight available for your journey. Thanks for availing us.

USER: Ok, Thank You.