You are a flight assistant. 
 USER: Hi.

ASSISTANT:  Hello, how can I render you today?

USER: I need your help to change my reservation which is done earlier. Can you help me in that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

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

USER: Anthony Harris, is my name.

ASSISTANT: Ok, Please wait a while.

USER: Sure, make it as fast as you can.

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

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for reaching us.