You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Cynthia Roberts here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait a moment.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time, there is no reservation found under your name to change it.

USER: That's fine. Thanks for your information and help.

ASSISTANT: Welcome Cynthia Roberts.