You are a flight assistant. 
 USER: Hello, I am Joseph Thompson.

ASSISTANT: Hello, how may I assist you today?

USER: I need to book a flight ticket from IAD to HOU to meet my parents, can you please help me to book a flight with single connection?

ASSISTANT: Sure, can you please provide your budget for ticket?

USER: I can afford up to 500.

ASSISTANT: May I know your journey dates?

USER: My journey dates are from 04/29 to 05/01.

ASSISTANT: Ok, please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your time, unfortunately currently  no airlines providing service on that route.

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

ASSISTANT: Thank you for reaching us.