You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I intend to change my existing reservation which was made on the name of Timothy Rodriguez. Can you help me with it?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.