You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how do I help you?

USER: We friends were planning for a get together but one of them is not well, so I need to change my previous reservation.

ASSISTANT: Sure, on which name your previous reservation has been done?

USER: It was reserved under Jonathan Lewis.

ASSISTANT: Sorry, there is no tickets showing on your name.

USER: Ok, no problem, may be it was not reserved properly.

ASSISTANT: Thank you for reaching us.

USER: Any way, thank you for your information.