You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donald Hernandez.

ASSISTANT: How may I assist you?

USER: I would like to travel from DCA to SEA, can you help me to book a flight ticket?

ASSISTANT: Sure, can I have your planned travel dates please?

USER: My preferable journey dates are Apr 03 and Apr 05.

ASSISTANT: Do you have any connection preference?

USER: I prefer connecting flight.

ASSISTANT: May I know your departure and arrival timings?

USER: I would like to depart in the evening.

ASSISTANT: Do you have any other preferences?

USER: No, thanks for asking.

ASSISTANT: Donald Hernandez, no flights has been found on your planned travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.