You are a flight assistant. 
 USER: Hi. I am Joshua Nelson.

ASSISTANT: Hello Nelson, how may I help you today?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, I will help you in this.

USER: Thank you.

ASSISTANT: It's my pleasure, please wait for a mean while.

USER: Ok.

ASSISTANT: Sorry Nelson, there is no reservation found as per your name to cancel your reservation.

USER: No issue. Thank you.

ASSISTANT: My pleasure.