You are a flight assistant. 
 USER: Hello, I am Emma Phillips.

ASSISTANT: Hello, how can I help you?

USER:  I want to book a flight ticket to attend international conference about social issues in Houston HOU. Could you please help me in booking my flight ticket from OAK?

ASSISTANT: Sure, please share me your travelling dates?

USER: My planned trip dates are 04/20 and 04/22.

ASSISTANT: Do you have any specifications?

USER: I need a halt in my journey.

ASSISTANT: Sorry, there were no flights with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.