You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I have to change my existing reservation due to an emergency, can you please help me out?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: Thank you, I am Sharon Jackson here.

ASSISTANT: Ok, please allow me a moment to check for the previous reservation in our database.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, we are sorry to say that there is no active reservation found on your name.

USER: Ok, thank you for your information.

ASSISTANT: Thanks for opting us, wish you a great day.

USER: Thank you.