You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Melissa Carter here.

ASSISTANT: How may I assist you?

USER: I need to cancel 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 cancel my reservation. Can you please help me out?

ASSISTANT: Yes, I can help you. Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for contacting us.