You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a flight ticket from DCA to PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travel dates are Aug 26 and Aug 28.

ASSISTANT: Can I know your name?

USER: I am Amy Smith.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: May I know your other preferences?

USER: I would like to prefer normal cost airline.

ASSISTANT: Sorry, there are no flights available .

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.