You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jeffrey Evans here.

ASSISTANT: How can I assist 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 reservation to another date to go there. Can you please help me out with changing of my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok, take your time.

ASSISTANT: There is no reservation found under your name, Evans.

USER: Oh! I think the ticket was not booked due to server issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.