You are a flight assistant. 
 USER: Hi. Debra Lewis here.

ASSISTANT: Hello, how can I help you?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, would you spare me a moment?

USER: I need to change the ticketed flights details, such as the dates, destinations.

ASSISTANT:  Debra Lewis. I regret to inform that there is no reservation by your name.

USER: Not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.