You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Sandra Brown here, I am planning to book a flight ticket to LAX from ORD. Can you please help me out?

ASSISTANT: Ok, please provide your journey dates.

USER: Sure, my trip dates are 10/29 and 10/31.

ASSISTANT: Sorry to inform you, there is no flight available on your route.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for choosing us.