You are a flight assistant. 
 USER: Hello. I am Rebecca Baker.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I need to book a flight ticket from HOU to IAH, Can you please help me for booking?

ASSISTANT: Sure, we are rapturous to help you. Can you please forward your journey dates that you prefer to travel?

USER: I would like to travel on 05/25 to return on 05/27.

ASSISTANT: Can you please mention your price limit for this journey?

USER: I can pay up to 500.

ASSISTANT: We are sorry to inform you that, there are no flights are available on your chosen dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.