You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: May I know your name please?

USER: Janet Robinson here.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.