You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: Owing to an emergency, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, may I know your good name please?

USER: Thank you for considering my request. Myself Margaret Lee.

ASSISTANT: Please give me a moment.

USER: Sure, take your own time.

ASSISTANT: We did not find any active reservation on your given name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for choosing us.