You are a flight assistant. 
 USER: Hello, I am Raymond Allen.

ASSISTANT: Hello, how may I help you?

USER: I want to change an existing reservation.Can you please help me with new  reservation?

ASSISTANT: Ok, please wait a moment. I will check the details of reservation list and inform you. There is no reservation found with your name to change the reservation.

USER: That's Ok, no issues.

ASSISTANT: Thanks for contacting us. Have a great day.

USER: Thank you for your helping hand.