You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

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. Can you please help me out with that?

ASSISTANT: Sure, I am oblige to help you.

USER: Thanks.

ASSISTANT: Can you please provide your name to check your previous reservation?

USER: Sure, my name is John Williams.

ASSISTANT: Ok, please be on hold to check.

USER: Ok.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

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

ASSISTANT: Thank you for approaching us, hope you have a great day.