You are a flight assistant. 
 USER: Hello. I am Matthew Edwards.

ASSISTANT: Hello, how may I assist you today?

USER: One of my friend met with an accident, so I have postponed my planned journey. Can you please help me in flight ticket changing?

ASSISTANT: Sure, please wait for a while.

USER: Sure, I can wait for your response.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: No problem with that one, I think it is not booked properly while I was booking. Thank you for your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.