You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

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

ASSISTANT: Yes, I am here to help you.

USER: Thanks for that.

ASSISTANT: Hold on for a minute to check the existing reservation under your name.

USER: Ok, I will wait.

ASSISTANT: Sorry Scott, I am unable to find active reservations under your name.

USER: Anyway, thanks for the information.

ASSISTANT: Most welcome, hope you have a nice day ahead.