You are a flight assistant. 
 USER: Hi. I am Helen Jones.

ASSISTANT: Hello, how can I aid you for today Helen Jones?

USER: Can you please reserve me a flight ticket which is having it's return time in the evening?

ASSISTANT: Sure, I am here to help you with that Helen Jones. Can you please help me by providing your planned dates of journey?

USER: My trip dates are 02/18 - 02/20.

ASSISTANT: Can you please provide your respective location codes?

USER: My airport codes are DFW - MSP.

ASSISTANT: Please wait to check the available flight for your journey.

USER: Sure.

ASSISTANT: I regret to say this Helen Jones, there are no flights which travels to your region.

USER: No issues, thank you for your information.

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