You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please change my existing reservation, due to some personal issues?

ASSISTANT: Sure, please wait for a moment to check your details. Can you help me with your name?

USER: Sure, my name is Karen Moore.

ASSISTANT: Thank you for waiting, no reservation found on your name.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you.