You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is David Taylor.

ASSISTANT: Ok.

USER: I have a business meeting in Las Vegas, can you help me for booking a flight ticket?

ASSISTANT: Sure, can you please share your trip dates?

USER: Ok, my travelling dates are from 02/05 till 02/07.

ASSISTANT: Kindly share your airport codes?

USER: My travelling airport codes are from CLT to LAS.

ASSISTANT: Sorry, no flights are available on your route.

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

ASSISTANT: Welcome.