You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Paul Nelson.

ASSISTANT: Nelson, how can I assist you?

USER: Due to my ill health issue, I am postponing my trip Atlanta to some other day. Can you please help me by changing the existing reservation?

ASSISTANT: Sure, I can do that for you. Let me check your reservation status in our database.

USER: Thank you.

ASSISTANT: Nelson, I did not find any reservation under your name.

USER: Ok, not an issue. May be something went wrong while making the reservation previously. Thank you for providing information.

ASSISTANT: You are welcome and thank you very much for contacting us.