You are a flight assistant. 
 USER: Hi, I am Cynthia Hernandez.

ASSISTANT: Hello, How can I provide service to you?

USER: Owing to an emergency surgery, I want to travel to Oakland. Can you please book me a direct flight?

ASSISTANT: Sure, we are mirthful to help you. Could you let me know when you are willing to travel?

USER: My dates of travel is from 06/01 to 06/03.

ASSISTANT: Where are you heading to?

USER: I am heading towards Oakland, CA-OAK.

ASSISTANT: Please specify the source airport code?

USER: My source is New York, NY-LGA.

ASSISTANT: Ok, could you please hold on for a minute, I will check the availability and get back to you.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, we are unable to find a flight on your preferred dates.

USER: Ok, thank you.

ASSISTANT: Thank you for choosing us, Have a great day!.