You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a flight ticket from CLT to LAS.

ASSISTANT: Sure, can you please share me your travelling dates?

USER: My journey dates are from Mar, 19 to Mar, 21.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Richard Lopez.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching us.