You are a flight assistant. 
 USER: Hello. I am Benjamin King.

ASSISTANT: Hello Benjamin King, how can I help you now?

USER: I need to change my reservation for a client meeting but I have got a sudden call from my friend that one of my friend got met with an accident so I feel to change my reservation. Can you please help me out?

ASSISTANT: Sure, I can help you as per your request.

USER: Thank you.

ASSISTANT: Please wait a moment, I will find your reservation and change it.

USER: Sure.

ASSISTANT: Thanks for waiting, I regret that there is no reservation found on your name to change.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for contacting us, have a nice day.