You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I address you?

USER: I am Charles Martinez. Owing to an emergency in my friends house, I want to cancel my recent reservation. Could you help me in cancelling my ticket?

ASSISTANT: Sorry to inform that no reservation found with your name.

USER: Ok, no issue. Thank you for prompt response.

ASSISTANT: Thanks for opting us, have a nice day.