You are a flight assistant. 
 USER: Hello, I am Samantha Williams.

ASSISTANT: Hello, how may I assist you?

USER: Can you aid me in changing my dates in previous reservation?

ASSISTANT: Sure, hold on for a moment.

USER: Take your time.

ASSISTANT: Let me check.

USER: Go ahead.

ASSISTANT: Sorry Samantha, there are no flights reserved on your name.

USER: No issues. Thank you for checking and clarifying me.

ASSISTANT: Welcome.

USER: Welcome.

ASSISTANT: Thank you for choosing us.