You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Sarah Taylor want to change my existing reservation, Can you help me out?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for opting us.