You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Hernandez.

ASSISTANT: How may I lend a hand to?

USER: I need to change my reservation due to my planned event got postponed. So please help me with that.

ASSISTANT: Mary Hernandez, I am willing to help you for this. Let me check your reservation status in our database.

USER: Thank you. I will wait for your response.

ASSISTANT: Mary Hernandez sorry to intimate, no reservation is found with your criteria.

USER: Oh! It may not be booked properly due to server issues. Anyway, thank you for your time.

ASSISTANT: Thank you very much for utilizing our agency.