You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how best I can serve you at this moment?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please let me know your name to proceed further.

USER: Sure, my name is Shirley Rodriguez.

ASSISTANT: Ok, please be on hold.

USER: Sure, I will wait.

ASSISTANT: Sorry, we could not find any reservation with your name in our portal.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.