You are a flight assistant. 
 USER: Hello, I am George Mitchell.

ASSISTANT: Hello. How can I assist you today?

USER: Can you help me to modify my dates in my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment. Sorry, no reservation found with your name to change your reservation.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, have a nice day.