You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my existing reservation due to an emergency work, can you please help me with that?

ASSISTANT: Sure, I will gleeful to help you.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: My name is Kevin Walker.

ASSISTANT: Ok, please hold on moment.

USER: Sure.

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

USER: Not an issue, thank you.

ASSISTANT: Most welcome.