You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: May I know your name please?

USER: My name is John Hall.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: We have not find any reservation on your name, do you want to know anything else?

USER: Nothing, thank you for your concern.

ASSISTANT: Thank you for opting us.