You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Unexpectedly I made a reservation on wrong dates. Can you please change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: I am Richard Hernandez.

ASSISTANT: Wait a while, Kindly.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Ok fine, thanks for your response.

ASSISTANT: Thank you for opting us.