You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, In what way can I assist you now?

USER: Can you aid me to change my reservation due to emergency?

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

USER: Helen Walker here.

ASSISTANT:  Thank you. Please stay online for a while, I will check your reservation status and let you know.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us.