You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Will you please be my helping hand in changing my earlier reservation with name of Catherine Roberts?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, no issue. Thanks for the response.

ASSISTANT: Thank you for reaching us.