You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me in this?

ASSISTANT: May I know your name?

USER: Sure, my name is Kenneth Thomas.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Anyways, thank you for your service.