You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I assist you today?

USER: I am Donald Wilson. Owing to an emergency, I need to cancel my recent reservation.

ASSISTANT: Sure, we are here to help you. Please hold a minute.

USER: Ok.

ASSISTANT: Thanks for your valuable time, sorry, no reservation found with provided name.

USER: Thanks for your assistance.

ASSISTANT: Thanks for reaching us.