You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for your help?

USER: I am Mark Evans. I am looking for a flight with single connection to reach Houston, TX-HOU, can you help me with booking a flight?

ASSISTANT: Sure, please let me know your travelling dates.

USER: Sure, my journey dates are 11/25 and 11/27.

ASSISTANT: Do you need a way station in between?

USER: Yes, I need a halt.

ASSISTANT: Ok, please mention your source code.

USER: Sure, I will start from San Francisco, CA-SFO.

ASSISTANT: Ok, thanks for giving your details. There are no flights available at this moment on your requested dates.

USER: Ok, no worries.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your time.