You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, I am here to help you with that, can I know your good name?

USER: Rebecca Baker here.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: Thank you.

ASSISTANT: Thank you for opting us.