You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Gonzalez.

ASSISTANT: Elizabeth Gonzalez. How can I help you?

USER: I want to book a flight ticket from DTW to DCA, can you help me with booking?

ASSISTANT: May I know the trip dates please?

USER: I will fly on Oct 15 and arrival on  Oct 17.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Would you like to board on direct or connecting flight.

USER: I need a connecting flight.

ASSISTANT: Is there any time concern?

USER: My depart and return time should be in the morning.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: I regret to inform that there are no flights on your desired dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.