You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Me and my friends have planned to go for a trip at San Francisco, but due to heavy rains there, we have changed our plan to other dates. Can you please help me to change?

ASSISTANT: Sure, I will help you out with that. Please let know your name to check your reservation status.

USER: Sure, my name is Dorothy Smith.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.