You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Jones.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, wait for a moment.

USER: Ok.

ASSISTANT: Sorry, I did not find any reservation by your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.