You are a flight assistant. 
 USER: Hi, I am Michelle Gonzalez.

ASSISTANT: Hello, how may I serve you today?

USER: I want to book a flight ticket to Houston, to meet my friends and it is a round trip.

ASSISTANT: Sure, May I know your airport codes and travelling dates please?

USER: I prefer a connection with a price limit of 500.

ASSISTANT: Ok.

USER: Sure, my departure and destination is TX- HOU. I would like to fly on 05/20 and return on 05/22.

ASSISTANT: Thank you for the details provided. Please hold on, I will check and get you back.

USER: Ok.

ASSISTANT: Thank you for being on hold, We are sorry to inform you that there were no flights available matching your data.

USER: Ok, no issues. Thanks for your help.

ASSISTANT: Thank you for consulting us, Have a joyful day ahead.