You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dorothy Clark.

ASSISTANT: How may I assist you?

USER: I need a flight ticket booking from PHL to LAX to attend a seminar, so could you please guide me with flight ticket booking?

ASSISTANT: Sure, may I know your travel dates?

USER: Thank you and my travel dates are Nov 16 and return back on Nov 18.

ASSISTANT: At what time do you like to travel?

USER: I want to depart in afternoon time.

ASSISTANT: Sorry, there is no flight on your details.

USER: I need a business class flight , please check once.

ASSISTANT: I am sorry to say that there is no flight on your route.

USER: No problem with that one, I can prefer any other source to reach my location. Thank you for your help.

ASSISTANT: Thank you.