You are a flight assistant. 
 USER: Hello, I am Patricia Campbell.

ASSISTANT: Hello, how could I assist you today?

USER: I want to visit Houston due to holiday, can you help me in booking a direct flight? I can afford up to 500 only please make sure.

ASSISTANT: Sure, I am here to help you. May I know your travelling dates for checking the availability of flights?

USER: Ok,my intended travel dates are 10/10 to 10/12.

ASSISTANT: Ok, can you please provide your near by airport codes?

USER: I want to head to TX - IAH. My source is from Minneapolis & St. Paul, MN - MSP.

ASSISTANT: Thank you for providing information.

USER: That's ok.

ASSISTANT: Unfortunately, there were no flights found on your requested dates.

USER: It's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us. have a good day.

USER: Thank you.