You are a flight assistant. 
 USER: Hello, Kenneth Williams here.

ASSISTANT: Hello, how may I serve you?

USER: Due to change in the date of my Hockey match I need to change my flight booking accordingly.

ASSISTANT: Sure, please be on hold.

USER: Sure, I will be here for you.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.