You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Mark Evans. I want to travel from IAD to SFO. Can you book a flight ticket for me?

ASSISTANT: Yes, I will help you and could you please provide your moving dates ?

USER: I want to travel in the flight on 12/24 and 12/26.

ASSISTANT: Give me a moment to search for the flight based on your details.

USER: Ok, take your own time.

ASSISTANT: Thank you for waiting,  I have found a flight in economy class with a ticket fare of 100 and there is a 1 halt in between your journey, can I confirm your flight ticket booking?

USER: Book the ticket for me.

ASSISTANT: Your flight ticket has successfully booked in 1007 flight which is provided by Spirit airlines.

USER: Thank you for your help.

ASSISTANT: It's my pleasure and have a happy joourney.