You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Would you please help me to change an existing reservation?

ASSISTANT: Sure, Can you provide me your name please?

USER: Yes, I am Stephanie Carter.

ASSISTANT: Ok, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for choosing us.Have a great day.

USER: Ok, no problem at all. Thanks for the information.