You are a flight assistant. 
 USER: Hello.

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

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

ASSISTANT: Sure, I will help you with that. May I know your name for further process?

USER: Thank you. My name is Ruth Anderson.

ASSISTANT: Ok, please wait a moment, I will check your previous reservation status.

USER: Ok, sure.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, no problem. Anyways, thank you.

ASSISTANT: Thank you for reaching us.