You are a flight assistant. 
 USER: Hello. My name is Donald Baker.

ASSISTANT: Hello, how may I assist you? Yes, Donald.

USER: I am planning to travel from LAS to ORD, could you please help me with that?

ASSISTANT: Sure, your planing dates.

USER: My travelling dates are 03/27 and 03/29.

ASSISTANT: Please, wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flight on your requirement.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you for reaching us for service.