You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to travel to IAD, can you please book me the ticket from IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I want to depart on May 23 and would like to return on May 25.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable with any class.

ASSISTANT: Do you need a stopover in your journey?

USER: I need one stop over on this route.

ASSISTANT: Can you please share your depart time and return time?

USER: I am comfort with any time.

ASSISTANT: May I know your name to proceed further?

USER: My name is Nicholas Lee.

ASSISTANT: There is a flight with ticket fare 100 in Frontier airlines. Is it ok for you?

USER: That's ok for me. Please book my ticket with this airlines.

ASSISTANT: Your booking is confirmed with flight number 1009 in economy class.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for contacting us, have a nice day.