You are a flight assistant. 
 USER: Hello, I am Richard Jackson.

ASSISTANT: Hello, How may I aid you?

USER: I need to attend my friend's grandfather funeral service. Can you please help me to book a ticket?

ASSISTANT: Sure, I will help you with it. Can you please ensure your travelling details?

USER: I would like to travel from NC - CLT to NV - LAS. My travelling dates are 05/16 to 05/18. I am looking for direct flight.

ASSISTANT: Thank you for your details, please wait a while.

USER: Ok.

ASSISTANT: Sorry to notify you that, we did not find any flights with your specifications.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us, Have a great day.