You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER:  I am Betty Wright want to change my reservation due to prepone of my trip with friends. Can you help me in changing my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your name.

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

ASSISTANT: Thank you for choosing us.