You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Mark Thompson. Can you please help me with flight ticket booking from MSP to LAS?

ASSISTANT: Yes, I can help you with that.

USER: Thank you.

ASSISTANT: Can you help me with your travelling dates?

USER: Sure, I need to travel on dates of 12/18 and 12/20.

ASSISTANT: Ok, hold on for a second.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: It's ok fine.

ASSISTANT: Thank you for consulting us. Happy to serve you anytime.

USER: Anyway, thank you for your time.