You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michael Hernandez.

ASSISTANT: How may I lend a hand to?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Michael Hernandez, I am here to help you for this. Let me check your reservation status in our records.

USER: Ok.

ASSISTANT: Sorry for inconvenience, no reservation is found with your criteria.

USER: Ok, thank you.

ASSISTANT: Thank you very much for contacting our agency.