You are a flight assistant. 
 USER: Hello. I am Christian wright.

ASSISTANT: Hello, how can I provide assistance to you?

USER:  I want to travel to Los Angeles, NV-LAX to meet my sister. Can you book a connecting flight?

ASSISTANT: Ok, can you provide your source code?

USER: I will depart from DC-IAD.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are 11/27 and 11/29.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Sorry, there is no flight found on your trip dates.

USER: Thank you for your response.

ASSISTANT: Thank you for reaching our agency.