You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a connecting flight ticket to attend an client meeting which is going to held at DC. Can you help me?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Thank you. Oct 27th and 29th are my travelling dates.

ASSISTANT: Please provide your airport codes.

USER: Sure, BOS and IAD are my airport codes.

ASSISTANT: Do you have any preferences about class?

USER:  No. But, I would like to depart in the afternoon.

ASSISTANT: Do you have any preferences about airline?

USER: No.

ASSISTANT: Please mention your name.

USER: Myself Gregory Moore.

ASSISTANT: There are no flights found under your preferable details.

USER: No issue. Thank you.

ASSISTANT: Welcome, have a great day.