You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Will you please book me a flight ticket from SFO to DCA?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I will leave on Dec 6th and return on Dec 8th.

ASSISTANT: Do you have any other preferences?

USER: I am looking for a direct flight.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's alright, thanks for your support.

ASSISTANT: Can I know your name?

USER: I am Elizabeth Hernandez.

ASSISTANT: Thank you for reaching us.