You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to travel from DCA to LAS for a meeting, can you please reserve a flight ticket between those locations?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My departure and arrival will be on June 29 and July 31.

ASSISTANT: Can I have your name please to proceed further?

USER: Sure, my name is Larry Thomas.

ASSISTANT: Do you have any connection preference?

USER: Yes, I would prefer single connection for my journey.

ASSISTANT: Do you have any other specifications?

USER: No, thank you for asking.

ASSISTANT: Larry Thomas, no flights has been found on your planned travel dates. Are we connected?

USER: Yes. I am in a busy work. Sad to hear that, I will reach another booking agency. Thank you for the information.

ASSISTANT: Thank you for reaching us.