You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Please share your name to proceed further?

USER: I am Ashley Green.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: There is no active reservation found under your name.

USER: Ok, not an issue.

ASSISTANT: Thank you.

USER: Thank you for checking.