You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Richard Rodriguez, I need to change my reservation as my exams got postponed. Can you please help me in changing my reservation?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Thank you for considering my request. Sure, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Not an issue, anyways thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.