You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you reserve a ticket from IAH to DFW?

ASSISTANT: Let me know your travel dates?

USER: My trip dates are Sep 26 to 28.

ASSISTANT: Can I know your name?

USER: I am Mary Jones.

ASSISTANT: Do you have any preference?

USER: I need a direct flight which departs in morning time.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.