You are a flight assistant. 
 USER: Hello, I am Brenda Smith.

ASSISTANT: Hello, how may I support you?

USER: I am an artist, would like to exhibit my paintings in arts festival which is in Washington with my friends. Would you please help me for reservation?

ASSISTANT: Sure, I am here to help you. When do you want to exhibit your paintings?

USER: I would like to depart on 02/28 and return on 03/01.

ASSISTANT: Ok, please mention your airport codes?

USER: My airport codes are TX-IAH and DC-IAD.

ASSISTANT: We found a direct flight with fare of 100 in UA airline. Shall I proceed for booking with 1000 airline?

USER: Do not proceed, I need a single connection.

ASSISTANT: Sorry we cannot provide connecting flight.

USER: Thank you for your help.

ASSISTANT: Thanks for choosing us.