You are a flight assistant. 
 USER: Hello, I am Sarah Rodriguez.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my existing reservation as my conference got postponed.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry for the in convince no reservation found with your name.

USER: Ok, thank you for your response.

ASSISTANT: Thanks for choosing us, have a good day.