You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Mark Scott here. Reserve a flight ticket for me that is from DCA to PHL. I need a connecting flight.

ASSISTANT: Sure, may I know your respective dates of journey please?

USER: My travelling dates for journey are 06/21 to 06/23. My price limit is less than 500.

ASSISTANT: There is a flight with the price limit of 600, are you ok with this booking?

USER: Sure, you can book it.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: You are welcome.