You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I am Samantha Davis, I am a sports player my sports event has been preponed. I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I can help you. Please hold on a while, I will check and change it accordingly. We did not find any reservation on your name to change it.

USER: Thanks for your information.

ASSISTANT: Thanks for contacting us, have a nice day.