You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am very busy with my meetings, so I am not able to complete my trip. Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am gleeful to help you out. Please provide me your name.

USER: My name is Jerry Smith.

ASSISTANT: Sorry. there is no reservation on your name in our database.

USER: That's ok, thanks for the information.

ASSISTANT: Thank you for reaching us.