You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am Susan Lewis. 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. May I know your good name, to check your existing reservation?

USER: I already mentioned above.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.