You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, we are happy to help you. May I know your good name?

USER: My name is Melissa King.

ASSISTANT: Sorry, we did not find any active reservation on your name in our data.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.