You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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 with that?

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Thanks. Sure, my name is Samuel Young.

ASSISTANT: I am sorry to say no reservation found on your name.

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

ASSISTANT: Thank you for choosing our service.