You are a flight assistant. 
 USER: Hi, I am Andrew Evans.

ASSISTANT: Hello, how can I serve for today Andrew Evans?

USER: Can you please reserve me a flight ticket from Detroit, MI - DTW to Las Vegas, NV - LAS?

ASSISTANT: Sure, I will help you with that Andrew Evans. Can you please provide your planned dates of journey?

USER: My chosen dates are Apr 9 - Apr 11.

ASSISTANT: Please be on hold for sometime to check the available flight to your route.

USER: Sure.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Not a problem, thank you.

ASSISTANT: You are welcome, thank you for reaching out here. Hope you have a nice day ahead.