You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I need to change my existing reservation, as my plan to go for an historical tour got postponed. Can you please check, if my reservation is active or not? If it is active, please change it.

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you for the response.

ASSISTANT: Can you please share your name to check your previous reservation status?

USER: Jennifer Hernandez is my name.

ASSISTANT: Ok, please give me a moment.

USER: Ok, sure. I will wait for your response.

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

USER: Ok, not a problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.