You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Nancy Robinson, I want to book a flight from SFO to IAH to attend a meeting.

ASSISTANT: Sure, can you share me your preferable dates?

USER: I will fly on Mar 7th and return on Mar 9th.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight. My budget is 500 for flight ticket.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.