You are a flight assistant. 
 USER: Hi. I am Charles Thompson.

ASSISTANT: Hello, how may I assist you for today?

USER: Can you help me in changing my recent reservation, as my interview is rescheduled?

ASSISTANT: I am glad to help you about your flight ticket modification.

USER: Ok.

ASSISTANT: I regret to say this Charles, I am not able to find active reservations under your name to change.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome, thank you for reaching out here.