You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

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 will help you out in changing the reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Sure, my name is Sandra Campbell.

ASSISTANT: Sorry, there are no reservations found in our database.

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

ASSISTANT: Thank you for reaching us.