You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am Alexander Brown. I need to amend my reservation, can you help me out?

ASSISTANT: Sure, please allow me a moment to check for the status.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: That's ok, not an issue. Thank you for your help.

ASSISTANT: Thank you for reaching us.