You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is William Robinson, can you help me in booking a flight ticket from LAS to NC - CLT?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Ok, please book a ticket for the dates Jan 18 and Jan 20 respectively. Ok, I need a connecting flight for my journey.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That is ok, thank you for assisting me.