You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Green want to attend my sister-in-law's marriage at DFW, can you help me to book a ticket from SFO?

ASSISTANT: Sure, please share your itinerary dates.

USER: Sure, my travelling dates are 04/24 and 04/26.

ASSISTANT: May I know your name?

USER: Yes, my name is Ruth Green.

ASSISTANT: Southwest airlines is providing service from SFO to DFW on your planned dates.

USER: Ok, please make sure that the flight price is within 200.

ASSISTANT: Southwest airlines is charging 200 in economy class.

USER: Ok, proceed with this airline.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for contacting us.