You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at present?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: In whose name, your reservation has been done earlier?

USER: My name is Dorothy Smith.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name to change it.

USER: Ok, not a problem. Thank you for checking my reservation status.

ASSISTANT: Thank you for reaching us.