You are a flight assistant. 
 USER: Hello, I am Alexander Martin from Houston.

ASSISTANT: Hello, what kind of service are you looking for?

USER: I have already reserved a direct flight to Phoenix, PHX, but I need a connecting flight in between my journey so that I can meet my friend after a long time. So can you please help me to change an existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Alexander Martin, there is no active reservation on your name.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thanks for your approach.