You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to visit Washington with my family members. Can you help me to book a ticket?

ASSISTANT: Sure, I am gleeful to help you. Would you please provide me your trip dates?

USER: My journey dates are 03/09 and 03/11.

ASSISTANT: Can you please share your airport codes?

USER: My airport codes are SFO-DCA.

ASSISTANT: May I know your connection limit?

USER: I need break in my journey.

ASSISTANT: Is there any class preferences?

USER: I am comfortable with any class.

ASSISTANT: Can you please share your airline preferences?

USER: I am comfortable with normal cost flight.

ASSISTANT: Do you have any other preferences?

USER: Departure time should be evening.

ASSISTANT: May I know your name?

USER: Mark Hill here.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for reaching us.