You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you help me in booking my flight ticket from DCA to MSP?

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: My trip dates will be Oct 6th to Oct 8th.

ASSISTANT: Can I know your good name?

USER: I am Alexander Lewis.

ASSISTANT: Do you have any other requirements?

USER: My depart time should be in the morning.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for approaching us.