You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Anthony Walker here.

ASSISTANT: Nice to meet you Anthony Walker.

USER: I planned for a trip, but suddenly my mother fallen sick. So I want to cancel my reservation, will you please help me with that?

ASSISTANT: Oh! That's really bad. Sure, just wait for a while.

USER: Ok.

ASSISTANT: I am sorry there is no reservation found with your name to cancel.

USER: That's ok. Thank you for your information.

ASSISTANT: You are welcome.