You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to book a flight ticket to CLT from IAD, can you please help me out?

ASSISTANT: Sure, let me know your travelling dates?

USER: Sure, my trip dates are May 29 and May 31.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I prefer direct flight.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: Can I know your good name?

USER: Sure, my name is Ryan Wilson.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.