You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do you make your experience better with us?

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

ASSISTANT: Sure, I'll help you with this. Please let me know your name to check the reservation status.

USER: Mark Harris here.

ASSISTANT: Ok, please wait a moment.

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.