You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I want to change my existing reservation, due to bad weather conditions. Can you please help me to change my reservation?

ASSISTANT: Sure, can you mention your name to check further?

USER: Thank you for the response. Previous reservation was done under the name of Katherine Hernandez.

ASSISTANT: Please wait.

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

ASSISTANT: Sorry, no reservation found on your name in our database to change it.

USER: Ok, no problem. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.