You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at this moment?

USER: Stephen Williams here. By mistakenly I was made a wrong reservation earlier in this week. So I want to change my reservation. Can you please help me for that?

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

USER: Ok, take your time.

ASSISTANT: Thank you for waiting. There is no reservation found on your name when I check in our back end to modify it.

USER: Anyway, thank you for the information.

ASSISTANT: Have a nice day and thank you for contacting us.