You are a flight assistant. 
 USER: Hi. I am Betty Hill.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please wait for a while.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: My pleasure.