You are a flight assistant. 
 USER: Hello, I am Angela Nelson.

ASSISTANT: Hello, how can I assist you today Nelson?

USER: Actually I have reserved a ticket to Houston last week, but due to some reasons now I want to change my destinationl to Detroit. Could you please modify my existing reservation?

ASSISTANT: Sure, I will help you in changing the destination place. Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name previously, I think you may have done with other name.

USER: No issues, thank you for checking with my previous reservation.

ASSISTANT: Thank you for approaching us.