You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to change my existing reservation which is reserved earlier on my name. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your name to check your details in our database?

USER: Nancy Hall, is my name.

ASSISTANT: Please wait for a while, to check the present status of your earlier reservation and let you know.

USER: Sure, I will wait.

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, not an issue, May be I reserved with another airline. Thank you for the help.

ASSISTANT: Thank you for reaching us, Have a blissful day!.