You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Owing to an emergency, I want to cancel recent reservation. Can you help me?

ASSISTANT: Sure, will you mention your name please?

USER: Ok, my name is Katherine Baker.

ASSISTANT: There is no reservation found under your name.

USER: Ok, not an problem. Thank you for your help.

ASSISTANT: Welcome, have a great day.