You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to book a  flight ticket from LAX to EWR?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My trip dates are July 18 and July 20.

ASSISTANT: Do you have any other preferences?

USER: I would like to return back in the afternoon time in economy class.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: No problem, thank you for the information.

ASSISTANT: Can I know your name?

USER: I am Gary Johnson.

ASSISTANT: Thank you for reaching us.