You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello.

ASSISTANT: How may I help you?

USER: I am Kenneth Hernandez, want to alter my recent reservation due to some changes in my plan. Please help me out with that.

ASSISTANT: Sure, please wait a minute.

USER: Ok, take your time.

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

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.