You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you. Please wait, let me check your reservation status in our database. May I know your name?

USER: I am Catherine Perez.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: You are welcome and have a nice day.