You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Myself Cynthia Gonzalez. Due to work load, I want to change my reservation dates. Can you help me?

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: Based on your request I checked with your name in our database but I could not find any reservation previously.

USER: It's ok, thank you.

ASSISTANT: My pleasure.