You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for today?

USER: Can you please help me in changing my reservation?

ASSISTANT: I am glad to help you about that, can you please let me know your name to check reservation status?

USER: Sure, my name is Karen Walker.

ASSISTANT: Please wait for sometime to check the reservation status under your name.

USER: Sure.

ASSISTANT: Sorry for the trouble which is caused to you, I have not found any reservation on your name in our database.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you.

ASSISTANT: You are welcome, thank you for reaching us.