You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I am ready to you help you with that.

USER: Thank you.

ASSISTANT: Can I have your good name please to check your reservation?

USER: Sure, my name is Nicole Rodriguez.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry Nicole Rodriguez, no reservation has found under your name to change.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thank you for your service.

ASSISTANT: Most welcome.