You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: Due to the sudden illness of my mother, I just want to cancel my reservation. Can you help me with that?

ASSISTANT: Sure, may I know your good name?

USER: Sure, I had a reservation with name  Gary Lewis.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation was found with your name.

USER: Ok, no worries at all.

ASSISTANT: Thanks for reaching us.

USER: I appreciate your quality customer service.