You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jacob Williams here.

ASSISTANT: How may I help you today?

USER: Can you please reserve a flight ticket from CLT to HOU for my business trip?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: Thank you, my departure is on Oct 29 and please book my return ticket also on Oct 31.

ASSISTANT: Do you have any other specifications?

USER: I would like to departure at evening time.

ASSISTANT: Sorry to inform you that, there are no flight's available based on your travelling dates.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.