You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Stephanie Carter.

ASSISTANT: How can I help you?

USER: Can you please help me to change my existing reservation that I made earlier to go for holiday trip?

ASSISTANT: Sure,please wait for a while.

USER: Sure.

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

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: Thank you.