You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name please?

USER: My name is Angela Lopez.

ASSISTANT: How can I help you Angela?

USER: Due to a sudden meeting, my friends trip is cancelled. Could you help me in changing the reservation?

ASSISTANT: Sure, please hold on for a moment. Sorry, there is no reservation found.

USER: That's ok. Thank you, have a good day.

ASSISTANT: Thank you for reaching us.