You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: There is a slight change in my existing reservation, can you please help me?

ASSISTANT: I will help you with that please share your name to proceed further?

USER: Thank you for your response. Myself Benjamin King.

ASSISTANT: No reservation found as per your preferences at the moment.

USER: No issue, anyway thank you for checking.

ASSISTANT: Thank you for choosing us.