You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I have to change my reservation which I have done earlier to participate in dance programme but unfortunately I have stay back here to take care of my injured friend.Can you help me with changing my reservation?

ASSISTANT: Sure, could you please share your name for further process?

USER: Sure, I am Anthony Harris.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok, sure.

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

USER: Oh! it might be done by my manager but he did not informed me yet.

ASSISTANT: Ok, are you expecting any other help from me Harris?

USER: No, I do not have any requirements.Any way thank you for your services.

ASSISTANT: You are welcome always and keep visiting us.

USER: You are welcome.