You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may  I serve you today?

USER: Can you please book me a flight ticket from DTW to HOU to meet my family?

ASSISTANT: Sure, can you please forward your journey dates?

USER: I have planned to travel on Dec 20th and return on Dec 22nd.

ASSISTANT: Do you have any connection limit?

USER: I like one connecting flight.

ASSISTANT: May I know your name please?

USER: John Hall.

ASSISTANT: Are there any more specifications?

USER: No, thanks.

ASSISTANT: Sorry, we could not find any flights matching your specifications.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.