You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: Laura Jones here. I want to change my travel dates on my ticketed flight. Can you change my flight ticket reservation?

ASSISTANT: Sure, please stand by.

USER: Ok.

ASSISTANT:  Sorry, no reservation found on your given name in our database to change it.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for contacting us.