You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I have to change my reservation as I have to prepare for my exams, can you please help me?

ASSISTANT: Sure, can you share your name to check further?

USER: My name is Kenneth Carter.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our portal to change it.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for contacting us.