You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Nicholas Campbell here. I want to travel from San Francisco to Seattle for a business meeting, can you please hep me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, I am glad to help you in booking. Can I have your trip dates please?

USER: Thank you for taking my request. I am planning to leave my location on 09/01 and please book my return ticket also on 09/03.

ASSISTANT: Ok, may I know your travelling airport abbreviates?

USER: I will prefer SFO and SEA as my origin and destination airport codes respectively because those airports are near and convenient for me to travel.

ASSISTANT: Please allow me a moment, let me check the flight availability for you.

USER: Ok, take your time but try to bring a best flight in my route.

ASSISTANT: Sorry Campbell, no flights are available on your route.

USER: Oh! Sad to hear that. Anyway, I will another alternative to complete my journey. Thank you for the information.

ASSISTANT: You are welcome, have a nice day. Thank you for reaching us.