You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Martinez.

ASSISTANT: What can I do for you now?

USER: I want to change my existing reservation as my exam got rescheduled. Please help me out.

ASSISTANT: Ok. Thanks for waiting. Sorry, there was no reservation on your name to change.

USER: No issues, thank you.

ASSISTANT: Thank you for connecting us.