You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you today?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. Let me know your name to check your reservation?

USER: Dennis King here.

ASSISTANT: Ok, 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: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us.