You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, may I know your name?

USER: David Clark here.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.