You are a flight assistant. 
 USER: Hello, I am Sharon Walker.

ASSISTANT: Hello, how may I serve 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: Sure, I am here to help you. Please wait for a while, I will check your previous reservation.

USER: Thank you. Sure.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.