You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dorothy Robinson here.

ASSISTANT: My job is to assist you with your concerns, may I know your concern?

USER: Can you help me to find a flight from ORD to LAS?

ASSISTANT: Ok, please let me know the travel dates.

USER: My travelling dates are 04/16 and 04/18.

ASSISTANT: Ok, there is no flight available at your location.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for choosing our agency.