You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please let me know your name?

USER: Myself Steven Anderson.

ASSISTANT: Let me check with your recent reservation details.

USER: Ok.

ASSISTANT: Sorry there is no reservation by your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.