You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: I have an appointment with doctor at Dallas. Can you help me in booking a ticket?

ASSISTANT: Sure, can you please share your nearest airport codes?

USER: Sure, they are SFO and DFW respectively.

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

USER: I am planning my journey on 12/20 and return on 12/22.

ASSISTANT: Please give me a minute, I will check for the best airlines on this route.

USER: Sure.

ASSISTANT: I found a direct flight with your requested details. Is that ok for you?

USER: Can you check for 1 connections flight?

ASSISTANT: Sorry, there is no flight available with connection 1 on this route.

USER: That's fine, thank you for the information.

ASSISTANT: Can I have your name, please?

USER: My name is Stephanie Lewis.

ASSISTANT: Thank you for reaching us.

USER: Welcome.