You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Sarah Martin here.

ASSISTANT: There is no reservation found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.