You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Phillips.

ASSISTANT: How may I aid you today?

USER: Due to some emergency problem, I need to cancel my reservation.

ASSISTANT: Ok.

USER: Can you please help me?

ASSISTANT: I am here to help you for sure.

USER: Thank you.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for your time, but there is no reservation existed previously to proceed further.

USER: No problem. Thank you.

ASSISTANT: Thank you.