You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Parker.

ASSISTANT: How may I guide you?

USER: Can you help me in cancelling my recent  reservation, as my exam is postponed?

ASSISTANT: Parker, I am going to help you for this. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Parker sorry to inform that, no reservation is found on your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you Parker for utilizing our agency.