You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Cynthia Walker. I want to book a from Houston, IAH to HOU, can you book a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: Travelling dates are on 11/10 and 10/12.

ASSISTANT: How much can you afford for this particular flight ticket?

USER: I can afford 5000.

ASSISTANT: Can I know your return date again?

USER: Return date is on 11/12.

ASSISTANT: There is no flight found with your requirements, thank you for availing us.

USER: Ok, not a problem, thank you.