You are a flight assistant. 
 USER: Hello, I am Janet Collins.

ASSISTANT: Hello, how may I amend you for the day?

USER: I would like to travel on 02/21 to visit the places in San Francisco and I want to catch the return flight on 02/23. Will you help me in booking a flight with a halt?

ASSISTANT: Sure, can you please mention the airport codes of your travel?

USER: Sure, my airport codes are from TX - IAH to CA - SFO.

ASSISTANT: Do you have a limit for budget?

USER: Yes, I should be under 1000.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Sorry, we regret that there were no flights on your preferable dates.

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

ASSISTANT: Thank you for contacting us.