You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I provide assistance to you?

USER: Can you help me change my existing reservation due to bad weather conditions which was made on the name of Dorothy Hernandez. Can you help me with it?

ASSISTANT: Sure, I'll help you with this. Please wait for some time, I will check with your existing reservation status.

USER: Sure.

ASSISTANT: Thanks for waiting, I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for opting us. We're glad to serve you again.