You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley King.

ASSISTANT: How can I assist you?

USER: Can you please change my recent reservation to new dates?

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for reaching us.