You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Walker.

ASSISTANT: How may I guide  you?

USER: I would like to fly from Dallas & Fort Worth TX-DFW, will you please avail me in booking a flight ticket to Boston MA-BOS?

ASSISTANT: Nancy Walker, may I know your planned dates for this journey?

USER: My planned dates are 10/24 and 10/26.

ASSISTANT: Do you have any other preferences?

USER: I need a halt.

ASSISTANT: Sorry to inform you, there are no flights available on your requested route.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing our services. Have a nice day.