You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Shirley Harris. Can you please make my reservation from June 25 to June 27.

ASSISTANT: Sure, I will help you with that. Can you please share your source and destination airport codes?

USER: Sure, my airport codes are DCA and LGA?

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specifications?

USER: My return time is afternoon.

ASSISTANT: I am sorry to say that there is no flight found under your details.

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

ASSISTANT: Thank you for reaching us.