You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER:  I would like to attend my mother's birthday celebration at Washington, can you please help me to reserve flight ticket from ORD to IAD?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, my planned travelling dates are Jul, 07 and 09 respectively.

ASSISTANT: Can you please share your connection limit?

USER: I would comfortable with single stop over.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer to travel in economy class.

ASSISTANT: May I know your name please?

USER: Kimberly Nelson here.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait.

ASSISTANT: Kimberly Nelson, there are no flights available in your route.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.