You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you?

USER: I have to change my flight ticket reservation due to some issues, can you please help me in that modification?

ASSISTANT: Please provide your name?

USER: Sure, my name is Donna Nelson.

ASSISTANT: Ok. No reservation is available.

USER: Ok, not an issue with that one, thank you for your help.

ASSISTANT: Thank you.