You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Micheal Lopez. Can you please help me in changing my existing reservation, as my exam got postponed.

ASSISTANT: Sure, I will help you in changing the ticket. Sorry, there are no reservations found.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.