You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I serve you today?

USER: I am Benjamin Wright. I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. Can you help me in changing?

ASSISTANT: Sure, please wait a moment. I will check in the reservation list and revert to you with the current status.

USER: Ok.

ASSISTANT: Sorry Benjamin Wright, there is no active reservation on your name.

USER:  No problem. Thank you for your response.

ASSISTANT: Thanks for approaching us, hope to serve you again.