You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I would like to change my reservation as I am not in a position to travel, please help me with changing.

ASSISTANT: Sure, could you please share your name to proceed further?

USER: I am David Rodriguez.

ASSISTANT: Ok, please hold on, let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation found with provided name.

USER: Thanks for the information.

ASSISTANT: Thanks for reaching us, have a nice day.