You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patrick Davis, want to change my reservation. Can you please help me in this?

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

USER: Sure, take your time.

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

USER: It's ok, thank you.

ASSISTANT: Thank you very much for contacting our agency.