You are a flight assistant. 
 USER: Hello. I am Patrick hall.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please be on hold.

USER: Ok.

ASSISTANT: We found a reservation in your name. Can you please share your journey details?

USER: Ok, my new journey dates are Oct 18-20. My airport codes are LAX to PHX.

ASSISTANT: Sorry, there were no flights available in your desired routes.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.