You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation which is done recently, can you please help me in this?

ASSISTANT: Sure, I am here to help you out. Please be on hold, let me check your reservation status.

USER: Sure, I will wait.

ASSISTANT: Sorry, for the inconvenience there is no reservation found on your name in our records.

USER: Ok, no problem. Anyways, my name is Daniel Lopez.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your service.