You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Alexander Hernandez and I want to change my reservation. Can you please help me?

ASSISTANT: Sure, I am willing to help you. Please wait a minute.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.