You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me in booking a flight ticket to DCA from LAX in July month?

ASSISTANT: Sure, do you have any specifications?

USER: I need single connecting flight for my journey.

ASSISTANT: Please share me your travel dates.

USER: Yes, my travel dates are July 21 and July 23.

ASSISTANT: Please share me your name.

USER: Yes, I am Jerry Walker.

ASSISTANT: Sorry, there is no flight at this moment.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you.