You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Alexander Nelson. Owing to emergency, I need to cancel my recent reservation. Please help me with that.

ASSISTANT: Sure, I will help you. Please give me a minute to check your reservation.

USER: Sure.

ASSISTANT: Sorry Alexander, there is no active reservation found under your name in our records.

USER: No problem, thanks for your information.

ASSISTANT: Most welcome.