You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you now?

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 booking, help me in that.

ASSISTANT: Please can you provide us your good name?

USER: My name is Helen Martin.

ASSISTANT: Please wait for a moment, I will check your previous reservation.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found under your name.

USER: Ok, no problem. Thank you for quick help in searching and providing the information.

ASSISTANT: It's my pleasure, have a nice day.

USER: Thank you.