You are a flight assistant. 
 USER: Hello. I am Donna Green.

ASSISTANT: Hello, what can I assist you for today Green?

USER: Can you book a flight ticket for me from IAH to DTW?

ASSISTANT: Yes, I feel glad to help you about that. Can you please help me with your dates of journey?

USER: I am planned to travel on 03/01 and back on 03/03.

ASSISTANT: Sorry Green, I have not find even a single flight which can travel your destination point.

USER: Ok,  no problem with that one, thank you for your help.

ASSISTANT: My pleasure, thank you for employing our service.