You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Due to sudden work, I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: Kimberly Miller here.

ASSISTANT: Please allow me a moment while I check for the reservation status.

USER: Ok, take your own time.

ASSISTANT: Kimberly Miller, there is no reservation found under your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for contacting us.