You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: I was looking for a holiday in San Francisco and planned for a trip with my friend. But unfortunately my friend is unwell, so please cancel the flight ticket which I booked last week.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Give me a a minute, I will check it.

USER: Please cancel and let me know.

ASSISTANT: May I know your name please.

USER: It is Carolyn Johnson.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: It is ok not a problem.

ASSISTANT: Thank you for reaching us.

USER: I appreciate your response. Thank you.

ASSISTANT: Welcome.