You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: I need to change my reservation due to urgent meeting, can you help me?

ASSISTANT: I will help you with that. May I know your name?

USER: I am Mary Turner.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name in our database.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for contacting us, have a nice day.