You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Karen Hall here.

ASSISTANT: How can I help you assist 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. Can you please help me out with that?

ASSISTANT: Sure, I can assist you with that.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check your reservation status.

USER: Sure, take your time.

ASSISTANT: There is no previous reservation available in your name Karen Hall.

USER: Oh! I think the ticket was not booked properly while I am booking. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Welcome.