You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me in booking a flight ticket from BOS to HOU?

ASSISTANT: Let me know your travel dates.

USER: I want to travel on 06/05, and return on 06/07.

ASSISTANT: Can I know your name?

USER: I am Rachel Evans.

ASSISTANT: Do you have any preference?

USER: I want to return in the afternoon time, and I prefer for business class.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the information.