You are a flight assistant. 
 USER: Hello. I am Mark Wilson.

ASSISTANT: Hello Mark, how can I help you?

USER: Actually, I am planning to travel from NY-LGA to MN-MSP. Can you help me out?

ASSISTANT: Sure, please tell me your travelling dates?

USER: These are my traveling dates 08/31 to 09/01.

ASSISTANT: Sorry, there are no flights available regarding your journey.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you and have a nice day.