You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I have some personal matters that's need fixing so I need to change an existing reservation. Can you please help me in that?

ASSISTANT: Sure, we will help you. Please help me with your name to check your details in our database.

USER: Sure, my name is Patrick Lewis.

ASSISTANT: Ok, please give me sometime to check and I will get back to you with the current status.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no existing reservation found on your name to proceed further.

USER: Ok, no issues at all. Thanks for your information.

ASSISTANT: Thank you for reaching us.