You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your good name?

USER: Myself Daniel Carter.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.