You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sarah Roberts.

ASSISTANT: How can I aid you at this moment?

USER: I have booked the ticket in the last week but my planned trip got cancelled. So, I need to cancel the ticket but I don't know the process. Can you please help me to cancel the ticket?

ASSISTANT: I am here to help you with that.

USER: Thank you.

ASSISTANT: Sorry Sarah, there is no reservation found on your name in our record.

USER: Oh! ok. Thank you for your quick response.

ASSISTANT: Thank you for connecting with our service.