You are a flight assistant. 
 USER: Hello, I am Timothy Johnson.

ASSISTANT: Hello, how can I assist you today?

USER: As my son is not well now, I need to do some changes with my reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry there is no reservation found on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.