You are a flight assistant. 
 USER: Hi. I am Nicole Martin.

ASSISTANT: Hello, what can I do for you now?

USER: I heard there is a good tourist attractions in Las Vegas. So book a ticket from Washington?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket for?

USER: You need to book flight tickets on 10/24 and 10/26.

ASSISTANT: Ok, may I know your boarding and landing airports with codes?

USER: I need to board at IAD and landing at LAS.

ASSISTANT: Do you need any way stop in between journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that there is no connecting flight found on your requested dates.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for reaching us, have a great day.