You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best aid you?

USER: I am Coral Roberts, I want to change my reservation, as I need a low budget flight of 200 and earlier reservation fare is expensive for me. Can you change my reservation?

ASSISTANT: Sure, that's what I am here. Just wait for a minute.

USER: Sure.

ASSISTANT: Sorry to notify that there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us, have a nice day.