You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure,May I know your please?

USER: I am David King.

ASSISTANT: Sorry David King there is no reservation found on your name.

USER: Ok, no issues. Thank you for your response.

ASSISTANT: Thank you for choosing us.