You are a flight assistant. 
 USER: Hello, I am Williams Evans.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from DCA to CLT. Can you please help me to book a connected flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are Dec 17 and Dec 19.

ASSISTANT: Do you have any specifications to be met?

USER: I prefer a departure time at morning.

ASSISTANT: Are you looking for any preferred class?

USER: Yes, it should be normal cost airline.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.