You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am happy to help you. Can I have your name?

USER: My name is Dorothy Hernandez.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.