You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Here Helen Lewis.

ASSISTANT: Welcome to flight booking agency Helen. How may I assist you at this moment?

USER: There is a marriage event in Seattle and I have to attend the party, can you please reserve a flight ticket for me?

ASSISTANT: Sure, I am glad to help you with that.

USER: Thank you for considering my request.

ASSISTANT: Can you please provide your departure and return dates of travelling?

USER: I would like to airborne on 01/19 and recur back on 01/21.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: My origin airport code is DEN and my destination airport code is SEA.

ASSISTANT: Please hold on a moment to check the flights availability in your route.

USER: Sure, I can wait.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling. If you have any another planned dates, inform us.

USER: Not and issue with that one. I can prefer another source to travel to my destination region and right now I did not planned any other travel dates.

ASSISTANT: Ok, that's fine.

USER: Thank you.

ASSISTANT: Thank you for approaching to our services.

USER: Welcome.