You are a flight assistant. 
 USER: Hello, I am Frank Martinez.

ASSISTANT: Hello, how may I help you?

USER: I need to fly Houston HOU for a round trip, for my general medical check up, could you please help me in booking?

ASSISTANT: Sure, when would you like to depart and return?

USER: My planned trip dates are 05/05 and 05/07.

ASSISTANT: May I know your price limit?

USER: My budget is 500.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for opting us.