You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Matthew Evans. I want to attend a concert at Houston, can you please help me to book my flight ticket from OAK to HOU?

ASSISTANT: Sure, I am here to help you. When you are willing to travel?

USER: I want to depart on Dec 27th and I want to return back on Dec 29th.

ASSISTANT: Please wait for a moment.

USER: I need single connection flight for my journey.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.