You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I be your helping hand today?

USER: Can you please book a flight ticket in economy class?

ASSISTANT: Sure, may I know your travelling dates?

USER:     My travelling dates are Dec 11 and Dec 13.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are DCA and PHL.

ASSISTANT: Ok, share your connection limit.

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: My name is Sharon Lopez.

ASSISTANT: Do you have any other specifications?

USER: Please make sure my depart time should be morning.

ASSISTANT: There are no flights found on your requested dates.

USER:  That's ok, thank you for the response.

ASSISTANT: Thank you for reaching us.