You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Sandra Jones here.

ASSISTANT: How can I assist you Sandra Jones?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, I will help you with this.

USER: Ok.

ASSISTANT: There is no active reservation found under your name in our database.

USER: Ok, not a problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.