You are a flight assistant. 
 USER: Hello. Sandra Perez here.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Actually, I am looking for a flight having single connection because my friend also booked the same flight that I want to travel, so can you please help me out with booking of a flight ticket from Seattle on 07/21?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: Can you please let me know your preferable airport code names?

USER: Sure, I want to travel from SEA to DEN.

ASSISTANT: Is there any return trip that your planning to SEA?

USER: Yes, I would like to return on 07/23.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check the best flights available in your route.

USER: It's alright, take your time.

ASSISTANT: Based on your information, Spirit airline is ready to serve you with 1 connection with a minimum fare of 300 is available for you. Shall I proceed with this?

USER: That's fine, you can proceed with booking.

ASSISTANT: Your flight ticket is booked successfully, flight number is 1016.

USER: Thank you for your help in booking of my ticket, have a nice day.

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

USER: Welcome.