You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

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

ASSISTANT: Sure, please wait for a minute.

USER: Ok.

ASSISTANT: There is no reservation available on your name to change further.

USER: Not an issue. Thank you.

ASSISTANT: Thanks for choosing us.