You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Due to some entrepreneurship meeting, I am going to change my existing reservation. Can you help me?

ASSISTANT: Let me know your name to check your reservation?

USER: Angela Moore here.

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

USER: No issue, thanks for the information.

ASSISTANT: Thank you for choosing us.