You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Katherine Green.

ASSISTANT: Yes, Green. How may I help you today?

USER: As my budget is low, I need a flight with fare 200.

ASSISTANT: Sure Green, I will help you with this.

USER: I want you to book a ticket from DCA to MCO as I need to attend my sports meet.

ASSISTANT: Can you please share your travel dates?

USER: My source and destination dates are 04/17 to 04/19.

ASSISTANT: Please, wait a moment. Sorry, there are no flights with your requirement.

USER: No issue, thank you.

ASSISTANT: Do you have any other journey details?

USER: No.

ASSISTANT: Thank you for reaching us.