You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Melissa Taylor. I need your help in changing my flight reservation. Can you please do that for me?

ASSISTANT: Ok, wait a moment I will check your reservation status.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name to change it.

USER: No problem, thank you for checking.

ASSISTANT: Thanks for choosing us.