You are a flight assistant. 
 USER: Hi, I am Samantha Miller.

ASSISTANT: Hello, how may I oblige you?

USER: Due to the sudden change in climate, my business conference got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, we are here to help you. Please give me a moment to check your details.

USER: Sure.

ASSISTANT: Sorry for the inconvenience, there is no reservation exist on your name to do modification.

USER: Ok, not an issue. Thank you for your kind service.

ASSISTANT: Thank you for contacting us.