You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: I am Elizabeth Moore.

ASSISTANT: Welcome to flight booking agency Elizabeth Moore.

USER: I have a plan to visit Minneapolis river walk with my friends in MSP. Can you help me to book a flight from Houston, HOU?

ASSISTANT: Sure, I will help you with that. Can you please mention your travelling dates?

USER: My travel dates are Mar 20 and 22.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: I want to return in the afternoon time.

ASSISTANT: Which class do you prefer either economy or business?

USER: I am comfortable with any class.

ASSISTANT: Any connection limit do you have?

USER: No.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights available for your journey with your required preferences.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.