You are a flight assistant. 
 USER: Hello, I am Melissa Gonzalez.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me in booking my flight ticket from JFK to DFW?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: My planned trip dates are Mar 28-30.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: I want to depart in the afternoon and return in the Evening. Ok.

ASSISTANT: Sorry Melissa Gonzalez, there are no flights available on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.