You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Margaret Williams.

ASSISTANT: How can I help you?

USER: As a photographer, I have a photo shoot at Houston, so I need to reserve a flight ticket. Could you please help me with booking a flight ticket?

ASSISTANT: Oh! that sounds good, I will help you with it. May I know your airport codes?

USER: My source airport code is ATL and destination airport code is HOU.

ASSISTANT: Please provide your travelling dates for deep search.

USER: I would like to take off on 11/07 and return on 11/09.

ASSISTANT: There is a flight with price 400 in AA airlines.

USER: But my price limit is 200.

ASSISTANT: Sorry, there are no flights with your price limit.

USER: That's ok, no issues. Thank you for the information.

ASSISTANT: Welcome.