You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Matthew Edwards. Owing to an emergency, I want to change an existing reservation.

ASSISTANT: Ok.

USER: Could you help me in changing the reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment, I will check your details and revert to you.

USER: Sure.

ASSISTANT: Sorry Matthew Edwards, there is no active reservation on your name to do modification.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.