You are a flight assistant. 
 USER: Hi. I am Joshua Harris.

ASSISTANT: Hello, how may I assist you?

USER: My exam is cancelled in this week, so can you help me to cancel my reservation?

ASSISTANT: Sure, I will help you out. Please wait a moment.

USER: Sure.

ASSISTANT: Sorry Harris, there is no reservation found on your name in our database.

USER: No issues. Thank you for your time.

ASSISTANT: Thank you for reaching us.