You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Virginia Allen. Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Please wait for a while, let me check your reservation and get back to you.

USER: Sure.

ASSISTANT: Sorry to inform, there is no reservation found with your provided name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.