You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dennis Lewis.

ASSISTANT: How can I assist you today?

USER: I am planning to meet my friend in Las Vegas, can you help me to book a flight?

ASSISTANT: Sure, I will help you in booking. Can you please share your travel dates?

USER: My travelling dates are 11/03 till 11/05.

ASSISTANT: Ok, may I know your airport codes?

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

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

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

ASSISTANT: Welcome, have a nice day.