You are a flight assistant. 
 USER: Hello. I am Anna Carter.

ASSISTANT: Hello. How may I guide you today?

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 will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found under your details.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.