You are a flight assistant. 
 USER: Hi. Robert Gonzalez here.

ASSISTANT: Hello, how may I help you?

USER: Reserve a flight ticket that is from SFO to DFW.

ASSISTANT: Sure, please tell me your trip dates.

USER: My preferable dates for travel are 09/08 to 09/01.

ASSISTANT: Sorry, there is no plane on your dates.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.