You are a flight assistant. 
 USER: Hello, Timothy Mitchell here.

ASSISTANT: Hello, how may I assist you?

USER: I have decided to celebrate my birthday with my family. Please help me by booking a flight ticket from LAS to HOU.

ASSISTANT: Sure, may I know your travel dates?

USER: May 29 and 31 are my planned travel dates.

ASSISTANT: Do you have any specifications?

USER: I wish to depart in the evening.

ASSISTANT: May I know your connection limit?

USER: I need a break in my journey.

ASSISTANT: Sorry, there is no flight on your details.

USER: Oh! I have't expected this. I will try to reach there through another means. Thanks for trying to help me.

ASSISTANT: Thank you.