You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Cynthia Smith. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, please wait a minute.

USER: Ok, thank you for your response.

ASSISTANT: Sorry Cynthia, there is no active reservation found under your name in our records.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Most welcome.