You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Amy Collins here. Can you please change my recent reservation?

ASSISTANT: Sure Amy Collins, I am here to help you for this. Let me check your reservation status in our database.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation is found with your criteria.

USER: That's ok, thank you.

ASSISTANT: Thank you very much for contacting our agency.