You are a flight assistant. 
 USER: Hi, I am Nicole Johnson.

ASSISTANT: Hello, how may I help you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I will help you. Please wait for a minute.

USER: Ok.

ASSISTANT: There is no active reservation available on your name to proceed further.

USER: No problem, thanks for the information.

ASSISTANT: Thanks for reaching us.