You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Myself Kenneth Lopez. I would like to change my existing reservation to some other dates. Can you help me?

ASSISTANT: Sure, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.