You are a flight assistant. 
 USER: Hello. I am Kevin Lee.

ASSISTANT: Hello. How can I help you today?

USER: Can you help me in booking a ticket from IAH to DTW?

ASSISTANT: Sure, I would be happy to help you with that.

USER: Thanks.

ASSISTANT: Can you please tell me your trip dates?

USER: My planning dates are from 02/17 to 02/19.

ASSISTANT: Wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found under your details.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you. Have a great day.