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: Sure, Let me know your name to check your reservation?

USER: Jessica Collins 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 reaching us.