You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sarah Robinson.

ASSISTANT: How can I assist you today?

USER:  I want to visit a historical place in Detroit. Can you help me to book a ticket from IAH to DTW?

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

USER: My itinerary dates are 06/17 and 06/19.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no flights found under your preferable details.

USER: No problem, thank you.

ASSISTANT: Welcome, have a great day.