You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, can you provide me your name?

USER: Sure, my name is Jessica Wilson.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT:  Jessica Wilson. I regret to inform that there is no reservation by your name.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.