You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to some urgency, I want to change my existing reservation.

ASSISTANT: Sure, can I know your name for checking the details?

USER: My name is Sarah Edwards.

ASSISTANT: Give me a minute, let me check the details.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, no issues. Thank you for checking the information.

ASSISTANT: Welcome.