You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Sure, may I know your name?

USER: Myself Emma Miller.

ASSISTANT: Sorry, we did not found any reservation under your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.