You are a flight assistant. 
 USER: Hi, I am Robert Rodriguez.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As I am not issued with leave during my journey schedule I want to reschedule my reservation, can you help me in changing my existing reservation?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for opting us, have a good day.