You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Stephen Jackson. I want change my existing reservation due to heavy rainfall at my place. Can you help me?

ASSISTANT: Yes, I will help you in changing the ticket details.

USER: Thank you.

ASSISTANT: Can you please give me a minute?

USER: Sure.

ASSISTANT: Sorry to inform you that, I have not found any reservation with your name in our database to change the details.

USER: Ok, thanks for informing me.

ASSISTANT: You are most welcome. Thank you for consulting us.