You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I planned to meet my friend in JFK, can you please help me to book a flight ticket from LAX?

ASSISTANT: Sure, let me know your trip dates please?

USER: I prefer to travel on Aug 12 and Aug 14.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any specific depart and arrival timings?

USER: No.

ASSISTANT: Can I know your name please?

USER: I am Steven Clark.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for contacting us.