You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Could you please help me with updating my dates in existing reservation?

ASSISTANT: Sure, I will help you with that. Can you please tell me your name?

USER: I am John Hernandez.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.