You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: Thank you for considering my request. Myself Susan Thomas.

ASSISTANT: Thank you very much. Please wait for a while, let me check your reservation status in our database.

USER: Sure, I will wait for your response.

ASSISTANT:  I am very sorry to inform you that there is no reservation found under your name in our database.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Thank you very much for approaching our agency.