You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Allen.

ASSISTANT: How can I assist you today?

USER: Due to an emergency, I am unable to travel to the trip which our friend's were planned, can you please change my recent booking?

ASSISTANT: Please give me a moment for checking the reservation.

USER: Sure.

ASSISTANT: Thank you for waiting. There is no reservation found under your name.

USER: I think my booking is not confirmed, so that's why it is not showing in your data base. Anyways, thank you for your search.

ASSISTANT: Welcome, have a great day.