You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, can you please let me know your name to check with the reservation status?

USER: I am Kimberly Johnson.

ASSISTANT: Please allow me 2-3 minutes, while I check for the reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation found under your name to change.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.