You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I have planned to change my reservation due to sudden change in my trip, can you assist me?

ASSISTANT: May I know your name please?

USER: Jonathan Clark.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.