You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Thomas Campbell. I need to change my existing reservation, can you please help me out?

ASSISTANT: Ok, I am here to help you.

USER: Thank you for your kind response.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for reaching us.