You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Brandon Wright.

ASSISTANT: How may I help you?

USER: Can you please help me in changing my recent existing reservation?

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

USER: Sure.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you very much for utilising our agency.