You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: Can you please help me to modify my recent reservation?

ASSISTANT: Sure, I will help you in changing the reservation. May I know your name please?

USER: Cynthia Carter here.

ASSISTANT: Sorry, there are no reservations found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.