You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you now?

USER: I need to cancel my ticket, can you help me?

ASSISTANT: Sure, please share me your good name?

USER: I am Sandra Williams.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation found on your name in our system data.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank for visiting us.