You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mark Lopez here.

ASSISTANT: How can I assist you at this moment?

USER: I want to scrap my previous reservation for now due to some health issues, can you help me?

ASSISTANT: Sure, I will help you with this.

USER: Ok, please help me soon with my ticket cancellation.

ASSISTANT: Mark Lopez, there is no active reservation found under your name in our database.

USER: Oh! No issues, thank you for checking for my existing reservation.

ASSISTANT: Thank you for contacting us.

USER: Most welcome.