You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, I'm always here to help you. Can you please provide your name to check the reservation list?

USER: My name is Nicole Mitchell.

ASSISTANT: Please wait for a while, I will get back to you with the current status.

USER: Sure.

ASSISTANT: Nicole Mitchell, we are sorry to inform you that there is no reservation found on your name to do modification.

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us. Have a nice day.