You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Alexander Nelson here, can you help me booking flight on 08/19 to attend my college event?

ASSISTANT: Sure Nelson. May I know your return journey date please?

USER: I am going to return on 08/21.

ASSISTANT: Please provide me your airport codes.

USER: My nearest airport codes are IAD to SEA.

ASSISTANT: Please give me a minute.

USER: Ok, I will wait for your reply.

ASSISTANT: Nelson, there are no flights available due to heavy bookings.

USER: Oh! It's ok, no problem. Thank you for your services.

ASSISTANT: Thank you for reaching us, have a good day.