You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Jacob Green.

ASSISTANT: How may I help you?

USER: Unfortunately I met with an accident, while practising for the bike race event. So, I cannot attend the event. Can you help me to change my reservation?

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Most welcome.