You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: I am Amy Hernandez. I want to change an existing reservation, due to my personal problems. Could you help me in changing a reservation?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No reservation found with name Amy Hernandez.

USER: Not an issue.

ASSISTANT: Thanks.

USER: Thank you for your information.