You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, let me go through the reservation list and revert you.

USER: Ok, I will wait.

ASSISTANT: It's unfortunate that we could not find any reservation by the name you provided.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.