You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Jennifer Mitchell, I want to change my reservation as my plan to visit Houston city is postponed. Can you help me to change my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, no flight reservation found with your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.