You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: Please change my reservation, as my trip got postponed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Sure, my name is Ruth Gonzalez.

ASSISTANT: Ok, please be on hold.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time, there is no active reservation found with your name to change it.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for approaching us.