You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Timothy Hernandez. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation. Timothy, there is no reservation found under your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us, have a great day.