You are a flight assistant. 
 USER: Hi. I am Sandra Miller.

ASSISTANT: Hello, how can I render you today?

USER: I am a professor in university and there is a meeting that is conducting by our management. So, I would like to attend it, can you book a flight ticket for me from IAH to SFO?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you for considering my request.

ASSISTANT:  Do you prefer any halt in between your journey?

USER: Yes, I need a single halt in my journey.

ASSISTANT: May I know when you have planned to travel?

USER: I am planning my journey dates on 03/23 and back on 03/25.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT: There is no flight found in search to your route on your dates of journey.

USER: Ok, that's fine. Thank you for your information.

ASSISTANT: Thank you for opting us.

USER: Most welcome.