You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: I want to change an existing reservation.

ASSISTANT: Sure, please provide your name to proceed further?

USER: Stephanie Wilson is my name.

ASSISTANT: Ok, please wait a moment, let me check your reservation with us.

USER: Sure, take your time.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thanks for your interest, have a great day ahead.