You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Could you please help me to update my travelling dates in my existing reservation?

ASSISTANT: Sure, I will help you. Please help me with your name.

USER: I made a reservation by this name Amanda Perez.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: Amanda Perez, I am really sorry to inform you that there is no booking found on your name.

USER: That's fine, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us. Have a great time.