You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Myself Andrew Taylor from Las Vegas. Could you please help me in flight ticket booking process from LAS to HOU?

ASSISTANT: Sure, I will help you. When would you like to plan your journey?

USER: Thank you for your response, I want to take off on Oct 12 and book my return ticket also on Oct 14.

ASSISTANT: May I know your class preference?

USER: I am ok with any class but I want to take off in evening time so please check with this.

ASSISTANT: Andrew Taylor, no flights has been found on your preferences.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.