You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you today?

USER: I want to change my existing reservation due to some technical issues. Can you help me with that?

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

USER: Thank you. Susan Anderson here.

ASSISTANT: 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: Ok, no issues. Thank you for your kind service.

ASSISTANT: Thank you for reaching us.