You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: My name is Paul Allen and I would like to change an existing reservation.

ASSISTANT: Ok, I will help you with that. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No issue, thank you for the time.

ASSISTANT: Thank you for connecting with us.