You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Please help me out in booking the ticket from CLT to PHL to meet my friend.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My trip dates will be Oct 27 to Oct 29.

ASSISTANT: Ok, which class do you prefer to travel?

USER: Economy class.

ASSISTANT: Do you have any requirements?

USER: I want direct flight. That's ok.

ASSISTANT: May I know your name?

USER: Helen Hernandez here.

ASSISTANT: Sorry to say, no flight is available for you as per your requests.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.