You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to book a flight ticket from MSP to DCA, Can you please help me for booking?

ASSISTANT: Can I know your travelling dates?

USER: I would like to travel on 08/07 to return on 08/09.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Let me know your name.

USER: John Johnson here.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thanks for your information.