You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with cancelling my previous booking now?

ASSISTANT: Sure, may I know your name?

USER: I have booked my ticket by the name of Sandra Martin.

ASSISTANT: Ok, please wait for a moment.

USER: I will be waiting for your response.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.