You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, may I know the name to check for the status?

USER: Shirley Williams is my name.

ASSISTANT: Please be on hold, I will get back to you in a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation have been found to amend it.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.