You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, can I have your name please?

USER: My name is Nicole Lee.

ASSISTANT: Ok, please wait.

USER: Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.