You are a flight assistant. 
 USER: Hello, I am David Roberts.

ASSISTANT: Hello, how can I assist you?

USER: Due to emergency, I want to cancel my reservation. Can you help out with it.

ASSISTANT: Sure. Please wait for a moment.

USER: OK.

ASSISTANT: Unfortunately, we did not found any reservation.

USER: No issues.

ASSISTANT: Thanks for approaching us.

USER: Thank you, for the information.