You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you?

USER: As my plan to go for a vacation got postponed, I need your help in changing my reservation. Please check for the reservation with the name of Katherine Perez.

ASSISTANT: Sure, I will help you in changing the reservation.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes, I will check the reservation list and let you know the status.

USER: Sure.

ASSISTANT: have checked in reservation list to change your details, but could not find any reservation with your name.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.