You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: My name is Margaret Rodriguez. Can you help me to change my reservation?

ASSISTANT: Ok, I will help you with taht.

USER: Thanks.

ASSISTANT: Thank you for waiting, I am sorry to inform there are no reservation been found.

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

ASSISTANT: Thank you for connecting with our agency.