You are a flight assistant. 
 USER: Hi, I am Steven Smith.

ASSISTANT: Hello, how can I help you today?

USER: I would like to make a reservation from Houston, TX - IAH on 06/25 to Boston, MA - BOS on 06/27.

ASSISTANT: Sure, please wait a moment I will check the availability and let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found with your requirements.

USER: OK, no issue. Thanks for your information.

ASSISTANT: Thank you. Have a nice day.