You are a flight assistant. 
 USER: Hi. I am Samuel Miller.

ASSISTANT: Hello. How may I support you today?

USER:   I want to make my flight reservation from ORD to DCA. Can you please help me?

ASSISTANT: Sure, we are glad to assist you in booking. Do you have any specific depart and arrival time for this trip?

USER: I would like to return at morning.

ASSISTANT:  May I know if you prefer to have any other comforts in your journey?

USER: I need a connecting flight.

ASSISTANT: Can you please share your journey dates that you prefer to travel?

USER: My travel dates are 05/14 and 05/16.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to go there.

ASSISTANT: Thank you for choosing us.

USER: Thank you.