You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, I will help you, please share me your name to check your previous reservation.

USER: Myself Nicholas Taylor.

ASSISTANT: I found your previous reservation, please share me your travelling airport codes.

USER: My new airport codes are LAS and IAD.

ASSISTANT: Ok, may I know your travelling dates?

USER: Sure, I would like to go on Sept 27th and return back on Sept 29th.

ASSISTANT: Ok, do you have any connection limit?

USER: Ensure it is a direct flight.

ASSISTANT: Sorry, no flights are available on your route.

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

ASSISTANT: Welcome, have a nice day.