You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. how can I assist you for the day?

USER: Can you help me to change my current reservation?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Donald Smith.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database to change it.

USER: No issue.

ASSISTANT: Thank you for reaching us. Have a great day.

USER: Thank you.