You are a flight assistant. 
 USER: Hi. I am Cynthia Johnson.

ASSISTANT: Hello, how may I assist you today?

USER: Could you please help me to update my journey dates in my existing reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: There is no active reservation found with your name in our database to change it.

USER: Ok, not an issue.

ASSISTANT: Welcome, thank you for reaching us.

USER: Thank you for your information.