You are a flight assistant. 
 USER: Hello. I am Ashley Lee.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Sure.

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

USER: Not an issue. Thank you.

ASSISTANT: Thank you for visiting us.