You are a flight assistant. 
 USER: Hi. I am Andrew Campbell.

ASSISTANT: Hello, how can I help you today?

USER: I would like to celebrate my birthday at Chicago, please help me in booking a ticket from IAH to ORD.

ASSISTANT: Sure, kindly share your travel dates.

USER: My trip dates are Feb 12 to Feb 14.

ASSISTANT: Do you have any connection preference?

USER: I need a direct flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: No issue, thank you.

ASSISTANT: Thanks for reaching us.