You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: Myself Kevin Smith due to some issues, I am going to change my existing reservation. Can you please help me?

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

USER: Thank you.

ASSISTANT: Sorry, there are no reservations found in our database.

USER: Not an issue, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.