You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Daniel Mitchell here. I have a plan to buy a new house in Las Vegas, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you for booking. Can you please provide me your travelling dates?

USER: My trip dates are from 03/19 till 03/21.

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes are from CLT to LAS.

ASSISTANT: Ok, give me a moment.

USER: Ensure that my connection should be 1.

ASSISTANT: Sorry, there is no flight is available for you.

USER: It's ok, thank you for checking.

ASSISTANT: Welcome.