You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to attend for my niece's marriage in Washington, so please book a flight ticket from ORD to DCA.

ASSISTANT: Sure, I am glad to help you. Can you please provide me your journey dates?

USER: I want to fly on July 15, return on July 17.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I want a flight with one connection.

ASSISTANT: Can you please share your airline preferences?

USER: I want normal cost airline.

ASSISTANT: May I know your depart and arrival timings?

USER: I am comfortable with any time.

ASSISTANT: May I know your good name please?

USER: My name is Angela Walker.

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

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.