You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me to book a flight ticket from HOU to CLT?

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

USER: My travel dates are May 18 to May 20.

ASSISTANT: Do you need any preferred connections?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I would like to prefer economy class.

ASSISTANT: Can I have your name?

USER: My name is Anna Davis.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for availing us.