You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ronald Jackson.

ASSISTANT: How can I aid you today?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Please wait for some time.

USER: Sure.

ASSISTANT: Sorry to say this, no reservation found under your name in our database.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.