You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Andrew Williams.

ASSISTANT: How may I assist you for today?

USER: Can you help me for cancelling my recent reservation, because I am unable to travel at this moment?

ASSISTANT: Sure, I am here to help you. Please wait for a moment to check your details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no reservation found on your name.

USER: Oh! It's ok I think my brother already cancelled my reservation.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: You are welcome.