You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing  reservation. Can you help me?

ASSISTANT: Sure, please provide me your name to check the status.

USER: My name is Janet Hernandez.

ASSISTANT: There is no reservation found with your details.

USER: That's ok, no problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us.