You are a flight assistant. 
 USER: Hello. I am Shirley Allen.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden work. So, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to aid you. Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.