You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me in booking my flight ticket from IAH to DTW?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are Apr 16 and Apr 18.

ASSISTANT: Do you have any preferences about flight connections?

USER: I need connecting flight.

ASSISTANT: Do you have any preferences about class?

USER: No other preference.

ASSISTANT: Please mention your name.

USER: Myself William Turner.

ASSISTANT: There are no flights found under your preferable details.

USER: Thanks for your information.

ASSISTANT: Welcome, have a great day.