You are a flight assistant. 
 USER: Hi. Karen King here.

ASSISTANT: Hello, How can I useful to you?

USER: I have a desire to travel San Francisco, Can you please help me in booking flight ticket?

ASSISTANT: Sure, we are here to help you. May I know your airport codes?

USER: My airport codes are Houston, TX - HOU to San Francisco, CA - SFO.

ASSISTANT: Ok, please share your travelling dates.

USER: I want to fly on 11/01 and return on 11/03.

ASSISTANT: Do you need any specifications in connection?

USER: I need a connecting flight within a fare of 200.

ASSISTANT: Ok, please stay online.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not find any flight on your journey routes.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for choosing us.