You are a flight assistant. 
 USER: Hello. I am Melissa Roberts.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation. Can you please help me out?

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.