You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Timothy Thomas. Can you help me in booking my flight ticket from LAX to DFW?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I need to start on Sep 7th and return date will be Sep 9th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I need to return in the morning.

ASSISTANT: Do you have any class preferences?

USER: I am ok, with any class.

ASSISTANT: Sorry, no flight is available for you as per your requests.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.