You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I will help you. May I know your name please?

USER: My name is Larry Hernandez.

ASSISTANT: Sorry, there is no reservation with your name to change.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: You are welcome.