You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I need to book a flight ticket to visit NASA space centre in order to complete my research at Houston. Can you help me with that?

ASSISTANT: Sure, I'll help you. Do you want any stop over with in your journey?

USER: Yes, I need a stop over.

ASSISTANT: Kindly provide me your fare limit.

USER: I can be able to afford up-to 500.

ASSISTANT: Please let me know your preferable travelling dates.

USER: My planned dates of journey are on 08/06 and 08/08.

ASSISTANT: Can I know your preferable journey points?

USER: I would like to travel from EWR to reach IAH.

ASSISTANT: May I know your name please?

USER: My name is Paul Brown.

ASSISTANT: Thanks for waiting, give me some time I will check and let you know.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your details.

USER: Thank you for your service.

ASSISTANT: Thanks for picking us, have a nice day.