You are a flight assistant. 
 USER: Hello, Ruth Gonzalez here.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my existing reservation, as my exams have postponed suddenly. Can you please help me with this?

ASSISTANT: Sure, I can help you with that. Please wait a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found on your name.

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

ASSISTANT: Welcome, thanks for consulting us.