You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. 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 travel dates?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: Sure, my name is Emma Phillips.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: Oh! May be I am not booked my ticket properly at that time. Thank you for your service.

ASSISTANT: Welcome.