You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change my existing reservation?

ASSISTANT: Sure, please share me your name to check the details.

USER: My name is Raymond Scott.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Raymond Scott, sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.