You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: William Edwards here. I would like to book a flight ticket from DTW to MSP, can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, can you share your travel dates please?

USER: Sure, I am planning to leave on 06/09 and please book my return ticket on 06/11.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting patiently. But I regret to inform you that that there is no flights available with us.

USER: Oh! So sad to hear. Anyway, thank you for the information.

ASSISTANT: Thank you.