You are a flight assistant. 
 USER: Hello, I am William Lewis.

ASSISTANT: Hello, can I provide assistance to you?

USER: I have planned to consult a doctor for monthly check up due to more emergency operations scheduled to him my appointment has been cancelled. help me in cancelling my reservation.

ASSISTANT: Sure, I will help you in cancellation. Please wait for a while, I will check your reservation and let you know the details.

USER: Sure, I will wait for your response.

ASSISTANT: I have checked your reservation in database but we could not find an y reservation on your name.

USER: No problem may be I have done with another airline.

ASSISTANT: Ok.

USER: Thank you for the response.

ASSISTANT: Thank you for reaching us, hope to serve you again.