You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello. How may I help you?

USER: Samuel Davis here. I want to cancel my reservation today because of my exams.

ASSISTANT: Please wait for a moment, let me check your details.

USER: Can you help me? Ok, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Oh! That's fine, thank you for assisting me.

ASSISTANT: Thank you for choosing our service.

USER: You are welcome.