You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is James Martinez. I want to make some changes in my existing reservation, can you please help?

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry James, there is no active reservation found under your name in our records.

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.