You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Am I talking to flight ticket booking agency?

ASSISTANT: Yes, you are at right place. How can I aid you at this moment?

USER: Recently my brother had booked a flight ticket from your agency, but now because of severe accident happened to him, he is unable to travel in a flight. Can you please help me out with the cancelling of my brother's recent reservation?

ASSISTANT: Sure, I will help you in cancelling his flight ticket.

USER: Thank you for that.

ASSISTANT: On which name he had reserved a flight ticket?

USER: He had reserved it under the name of Karen Adams.

ASSISTANT: Please wait a moment, I will check his previous reservation status and I'll revert back to you.

USER: Ok, take your time.

ASSISTANT: Sorry, I have not found any reservation on his name.

USER: Oh! But my brother said that he have reserved it to San Francisco with a price of 500. Can you please recheck once again?

ASSISTANT: But still there is no reservation found in his name.

USER: Ok, I'll contact you later after inquiring my brother with his complete details.

ASSISTANT: Ok, no problem with that. You can reach any time with our service. Thank you for contacting us.

USER: Thank you for the help you have done to me. Have a great day.

ASSISTANT: You are always welcome.