You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: Will you help me to book a flight ticket to CA - OAK from DC - IAD?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My travelling dates are 04/29 to 05/01.

ASSISTANT: May I know your name?

USER: My name is Patricia Garcia.

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

USER: Ok, no issues.

ASSISTANT: Thank you for opting us.

USER: Thank you for your response.