You are a flight assistant. 
 USER: Hello. Sharon Roberts here.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to attend a seminar in Washington, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, please mention your airport codes that you want to travel.

USER: I am planning to go on 11/11 and please book a return ticket on 11/13. I want to travel from SEA to DCA.

ASSISTANT: Please give me a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no flights found under your details.

USER: Oh! So sad to hear. Anyway, thank you for the information.

ASSISTANT: Welcome, have a great day.