You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Walker.

ASSISTANT: How can I aid you?

USER: I want to book a ticket from BOS to DTW. Could you please help me?

ASSISTANT: Sure, could you please share me your travelling dates?

USER: My preferable dates from 07/15 to 07/17.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry Patrick, there is no flight found on your name.

USER: That's ok no problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us, have a great day.