You are a flight assistant. 
 USER: Hi, I am Jonathan Evans.

ASSISTANT: Hello, How can I help you?

USER: I want to visit Houston IAH to enjoy houston underground tunnel tour. Can you make a reservation from OAK?

ASSISTANT: Please help me with your travel dates.

USER: Sure, my travelling dates are 12/27 and 12/29.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no worries at all. Thank you for your help.

ASSISTANT: Thank you for opting us.