You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jeffrey Gonzalez here.

ASSISTANT: How may I help you today?

USER: Please reserve a flight ticket from LAX to CLT for my business conference.

ASSISTANT: May I know your travelling dates, please?

USER: Thank you for considering my request, my departure is on Aug 21 and please book my return ticket also on Aug 23.

ASSISTANT: Please mention your specification.

USER: I would like to departure in evening time.

ASSISTANT: Do you need any connection limit?

USER: I will prefer single connection for my journey.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flight tickets available on your travelling dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you for reaching our service.

USER: Welcome.