You are a flight assistant. 
 USER: Hello. Myself Thomas Hill.

ASSISTANT: Hello, How can I assist you?

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

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.