You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Elizabeth Adams here. I am looking for a normal cost airline for my journey, can you please reserve a flight ticket from DCA to IAD?

ASSISTANT: Sure, can you share your trip dates?

USER: Ok, my boarding is on Jan 01 and please book my return ticket on Jan 03.

ASSISTANT: Do you have any preferences?

USER: I would like to departure at afternoon time and return would be at evening time.

ASSISTANT: Do you have any specifications?

USER: I will prefer single connection for my journey.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative.

ASSISTANT: Thank you for reaching us.