You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to fly from DCA to HOU. Can you book the ticket from that route?

ASSISTANT: Sure, may I know on which dates you are willing to travel?

USER: Sure, my planned travel dates are 04/05 and 04/07.

ASSISTANT: For further proceeding, may I know your good name?

USER: Sure, Sandra Phillips here.

ASSISTANT: May I know your class preference?

USER: No more specifications. Go ahead with the booking.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling dates.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us.