You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Daniel King.

ASSISTANT: How may I help you?

USER: I want to exhibit my arts at The National Gallery of Arts, so I need your help in booking ticket to IAD?

ASSISTANT: Ok. Please provide your journey dates?

USER: Sure, it's from 01/26 to 01/28.

ASSISTANT: Please specify boarding airport code?

USER: I am from DEN.

ASSISTANT: Please let me know flight connections limit?

USER: I prefer a single connecting flight.

ASSISTANT: Ok. No flight is available with your requirement.

USER: No problem, thank you for your time.

ASSISTANT: Thanks.