You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Mary Gonzalez, want to alter my recent reservation. Please help me out with that.

ASSISTANT: Sure, please hold a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.