You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I am Matthew White and I want to change my existing reservation, as my friend met with an accident. Will you help me in this?

ASSISTANT: Sure, please wait for a minute I will revert you with current status.

USER: Ok.

ASSISTANT: Sorry to inform that there is no reservation found with your name.

USER: No problem. Thank you for your information.

ASSISTANT: Thank you, have a nice day.