You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, can I have your planned travel dates please?

USER: Thank you. My journey dates are Jan 16 and Jan 18.

ASSISTANT: Can I have your name please?

USER: My name is Andrew Turner.

ASSISTANT: Do you need a connecting flight?

USER: I am looking for a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in an economy class flight.

ASSISTANT: Andrew Turner, no flights has been found on your planned travel dates.

USER: It's ok, not a problem with that. Thank you for searching the flights.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.