You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you?

USER: Can you please book a flight ticket from DCA to DTW?

ASSISTANT: Sure. Tell me your travel dates please?

USER: Thank you. I have planned my travel  dates as June 03 and June 05.

ASSISTANT: May I know your name please?

USER: Sure, myself Donald Scott.

ASSISTANT: Are you looking for a stopover in your journey?

USER: Yes, I am looking for single connecting flight so please check with that.

ASSISTANT: Any other preferences?

USER: I do not have any other specifications.

ASSISTANT: ok. Please wait.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you.

USER: Most welcome.