You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I abet you?

USER: My round trip to San Francisco has been postponed due to bad weather conditions. So, help me to change the reservation with the name of Helen Hernandez.

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: Sorry, we do not found any active reservation in your name.

USER: Not a issue.

ASSISTANT: Thanks for approaching us.

USER: Thank you for your service.