You are a flight assistant. 
 USER: Hi, I am Katherine Taylor.

ASSISTANT: Hello. How may I serve you?

USER: I would like to attend a board meeting at my head office in Washington, DC - IAD. Can you help me book a flight ticket from San Francisco, CA - SFO?

ASSISTANT: Sure, I will help you in booking. Do you need any stopover in between your journey?

USER: I need a lay by within my journey.

ASSISTANT: Could you please let me know your planned travelling dates?

USER: I would like to travel on 04/16 and 04/18.

ASSISTANT: May I know your price limit?

USER: 200 is my price limit.

ASSISTANT: Thanks for giving details, give me a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there are no connecting flights found with your required details.

USER: Ok, thank you.

ASSISTANT: Thanks for picking us.