You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you?

USER: I am Michael Johnson.

ASSISTANT: Ok.

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, please allow me a moment to check previous reservation.

USER: Sure.

ASSISTANT: Thanks for your patience, we did not find reservation on your name in our database.

USER: No worries, thank you for your service.

ASSISTANT: Thank you for selecting our service.