You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am William Clark.

ASSISTANT: How can I aid you today?

USER: Due to an emergency, I want to cancel my reservation. Can you please help me with it?

ASSISTANT: Sure, I will aid you with that. Please wait a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: I have found your reservation and cancelled successfully.

USER: Thank you.

ASSISTANT: Thank you for contacting us.