You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, give me a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.