You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I want to change my existing reservation. Can you help me for that one?

ASSISTANT: Sure, can I know your name please?

USER: Sure, Pamela Walker here.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for contacting us.