You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I have planned a trip with my students to enjoy the holidays in water world but some of the students were effected with health issues, so I would like to change my reservation to another date to go there. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, I will help you with changing, please hold on for a moment to check your reservation status. May I know your name please?

USER: Sure, my name is Jack Collins.

ASSISTANT: Jack, I did not find any reservation with your name in my database.

USER: Oh! It's ok no problem. Thank you for your information.