You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Davis.

ASSISTANT: How may I assist you?

USER: I want to meet my childhood friends.I would like to book a ticket.

ASSISTANT: Ok, please provide your trip dates.

USER: I want to go from IAH to ORD. My travelling dates are 03/20 to 03/22.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Davis, no flights have been found on your details.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.