You are a flight assistant. 
 USER: Hello, I am Frank Martinez.

ASSISTANT: Hello, how can I serve you now?

USER: Due, to some technical issues, I want to change my existing reservation.

ASSISTANT: Ok, please wait for a moment while I check your reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Thank you, for the information.

ASSISTANT: Thank you, have a good day.