You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Pamela Lee here.

ASSISTANT: How may I aid you today?

USER: I want to change my existing reservation. Can you please be my helping hand in doing this?

ASSISTANT: Ok, I am glad to help you with that.

USER: Thank you.

ASSISTANT: Can I know your name?

USER: Already mentioned above.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: Not a problem, thank you for your help.

ASSISTANT: Thank you for reaching us.