You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please help me in booking a flight ticket for me?

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: My travelling dates are 11/27 and 11/29.

ASSISTANT: Ok, may I know your airports codes please?

USER: My travelling airport codes are LAS to LGA.

ASSISTANT: Ok, may I know your name please for booking purpose?

USER: Myself  Helen Martin.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Ok, fine. Thank you for checking.

ASSISTANT: You are welcome.