You are a flight assistant. 
 USER: Hi. I am Jason Lopez.

ASSISTANT: Hello. How may I assist you?

USER: I would like to travel to Houston-HOU  to attend a meeting in sub branch office, can you book a flight ticket from OAK?

ASSISTANT: Yes, I will try for my best.

USER: Thank you.

ASSISTANT: Can you share me your travelling dates?

USER: I want to take off on 03/25 and arrival back on 03/27.

ASSISTANT: Sure, take your time. Sorry to inform you that there are no flights found on your requested dates.

USER: It's ok fine, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.