You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I need a flight with price limit 200, because I want to travel with low budget, can you please help me?

ASSISTANT: Ok, I can search it for you. can I have your journey dates please?

USER: I am departing on 06/19 and return on 06/21.

ASSISTANT: Ok, may I know your source and destination airport codes?

USER: My departure airport is HOU and destination airport is DTW.

ASSISTANT: Thank you for your information, please be on hold while I am checking.

USER: Sure.

ASSISTANT: Can I have your name please?

USER: My name Sarah Harris.

ASSISTANT: Sarah, sorry to inform you that no airline is ready to provide flight on your dates.

USER: That's fine, thanks for your information.

ASSISTANT: You are welcome.