You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I render you today?

USER: Owing to an emergency, my planned trip to New York has been postponed. So I request to change my existing reservation.

ASSISTANT: Sure, I will help you with that. On what name, do I need to check your reservation status?

USER: Sure, I have a recent reservation with name Katherine Harris.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for reaching us.