You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I want to visit Detroit to meet my client, can you book a ticket from IAH to DTW?

ASSISTANT: Travelling dates please?

USER: My trip dates are 02/12 and 02/14.

ASSISTANT: Can I have your name please?

USER: My name is Lisa Martinez.

ASSISTANT: Sorry Lisa, there are no flights available with your request.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you and have a nice day.