You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, please wait a moment, let me check with your details.

USER: Sure, I will wait.

ASSISTANT: Please mention your name, so I will be checking with the details.

USER: Sure, my name is Pamela Moore.

ASSISTANT: Sorry, there are no active reservations to change.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching our service.

USER: Thank you for your service.