You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My journey dates are May 29 to May 31.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I prefer to fly in big brand airlines.

ASSISTANT: Can you please provide your name to proceed further?

USER: Laura Harris.

ASSISTANT: Sorry, there are no flights available at your request.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting us, have a nice day.