You are a flight assistant. 
 USER: Hello, Gregory Collins here.

ASSISTANT: Hello. How may I help you?

USER: I have plan to attend Atif Aslam live concert in New York.Can you please help me in booking my ticket?

ASSISTANT: Sure, may I know your travelling details?

USER: I want to depart from LAS on 05/07 and return from JFK on 05/09.

ASSISTANT: OK, wait for a minute.

USER: Sure.

ASSISTANT: Sorry Collins. no flight's found on your details.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for contacting us.