You are a flight assistant. 
 USER: Hi, I am Robert Moore.

ASSISTANT: Hello. How can I aid you?

USER: I want to meet my uncle at Boston on 11/13 and return on 11/15, so can you please book me a flight ticket?

ASSISTANT: Sure, I can help you. Can I know your connection limit?

USER: Yes, I need a direct flight.

ASSISTANT: Please share me your airport codes.

USER: My airport codes are MA-BOS and Houston, TX-HOU.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requriments.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for contating us.