You are a flight assistant. 
 USER: Hi, I am Justin King.

ASSISTANT: Hello. How can I aid you?

USER: I just want to change my reservation as my interview got preponed, can you help me with this?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us.