You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Sharon Scott. Can you help me in booking a flight ticket from LAS to ORD?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I want to fly on Dec 24 and return on Dec 26.

ASSISTANT: Please give me a moment.

USER: Ok.

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

USER: Not an issue. Thank you for your information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.