You are a flight assistant. 
 USER: Hi. I am Kevin Wright.

ASSISTANT: Hello, how can I help you today?

USER: Please book a ticket from Dallas, TX-DFW to reach Houston, TX-IAH.

ASSISTANT: Sure, kindly mention your travel dates.

USER: My travel dates are from 04/23 to 04/25.

ASSISTANT: How much can you afford for this journey?

USER: I can afford up to 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us.