You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Helen Turner. Can you please book a flight ticket from BOS to DTW?

ASSISTANT: Sure, I am here to assist you. May I know your travel dates?

USER: Sure, I need to travel on dates of Oct 25 and Oct 27.

ASSISTANT: Ok, do you have any preferences?

USER: I am looking for connecting flight but direct flight is also fine with me.

ASSISTANT: Ok, please be on hold for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to tell you that there is no flight available on your given travel dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome and thank you for choosing us.