You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my recent reservation. Can you help me out?

ASSISTANT: Sure, We are here to help you. May I know your name?

USER: Dorothy Rodriguez.

ASSISTANT: Give me a minute.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for picking us.