You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you at this moment?

USER: My name is Pamela Martin. Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you. Can you please wait for a moment, I will check with your reservation.

USER: Ok.

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

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for choosing us, have a great day ahead.