You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Virginia Evans want to book a flight ticket to ORD from IAH, can you please help me in reserving a flight ticket?

ASSISTANT: Sure, May I know your travelling dates?

USER: My preferred dates are from Jan 18 to Jan 20.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: My depart time should be in the morning.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.