You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Myself Donna Hall. I want to meet my sister on her birthday, can you please help me to book my flight ticket?

ASSISTANT: Sure, help me with the trip dates?

USER: I want to depart on Nov 8th and I will return on Nov 10th.

ASSISTANT: May I know your airport abbreviates?

USER: I want to travel from SFO to DCA.

ASSISTANT: Sorry, we did not find any flights running in your desired routes.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us. Have a nice day.