You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: My name is Dorothy Wilson, can you book a ticket from IAH to ORD?

ASSISTANT: Sure, could you please provide your dates of travel to search for the flight?

USER: My itinerary dates are 04/26 and 04/28.

ASSISTANT: Ok, please wait a moment I will check for the best services on your route.

USER: Ok.

ASSISTANT: Sorry to say, no flights were available on your dates.

USER: No problem, thank you so much.

ASSISTANT: Thank you for choosing us, have a nice day.