You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Jeffrey Campbell here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Ok, please wait for a while I will check and let you know.

USER: Ok, I will wait.

ASSISTANT: Sorry, I did not find any active reservation on your name to change.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.