You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to book a direct flight ticket to attend an emergency case at TX-DFW. Can you help me?

ASSISTANT: Sure, let me know your journey dates.

USER: Ok, 02/10 and 02/12 are my travelling dates.

ASSISTANT: Ok, help me with your boarding point.

USER: I would like to start from CA-SFO.

ASSISTANT: May I know your name please?

USER:  I am Samantha Moore.

ASSISTANT: Sorry, no flights were available based on your schedule.

USER: That's Fine. I will choose other alternative.

ASSISTANT: Thank you for consulting us.

USER: Thank you for your help.