You are a flight assistant. 
 USER: Hello, myself Marry Scott.

ASSISTANT: Hello, how may I aid you today?

USER: I am tourist, I wish to visit Houston. Please help me to book a flight ticket.

ASSISTANT: Sure, please help me with your airport codes.

USER: My origin and return airport codes are LGA and HOU.

ASSISTANT: May I know your dates of journey?

USER: I have planned to travel to and fro from May 23 and 25.

ASSISTANT: Sure, do you need any specifications?

USER: I need a break in my journey.

ASSISTANT: Please hold for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for opting us.