You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, we are glad to help you. Please let me know your good name.

USER: I am Dennis Taylor.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting us.