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

ASSISTANT: Hello, how can I assist you today?

USER: I am going for a Grand Canyon Adventure at San Francisco so, can you avail me flight ticket?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Do you need any halt in between your journey?

USER: No, I need a direct flight.

ASSISTANT: Could you let me know when you are willing to travel?

USER: I am willing to travel on 04/17 and return on 04/19.

ASSISTANT: Where are you heading from?

USER: I am heading from Washington, DC-IAD.

ASSISTANT: Please specify the San Francisco airport code?

USER: My destination airport code is CA-SFO.

ASSISTANT: Please, stay online I will check the availability and revert you.

USER: Sure.

ASSISTANT: We are very sorry to notify you that there is no flight found based on your details.

USER: No problem, thank you for the information.

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