You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Andrew Phillips. Owing to an emergency, I would like to change my existing reservation.Can you please help me with changing?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our system data.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you, we hope see you again.