You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me in booking from DCA to LGA, as there is a family trip?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates are Sep 26-29.

ASSISTANT: Ok, could I have your name please?

USER: I am Stephanie Thompson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I am looking for a stopover flight in normal-cost airline.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok. Thank you for your help.

ASSISTANT: Thank you for choosing us.