You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please let me know how may I help you?

USER: I have planned to enjoy in Beer festival with my friends at Houston, IAH. Can you please help me for booking?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: May I know your source airport code?

USER: I want to start from Chicago, ORD.

ASSISTANT: Ok, please tell me your planned trip dates.

USER: My scheduled dates are Mar 20 and Mar 22.

ASSISTANT: Ok, may I know your name to proceed further?

USER: Sure, I am Nicholas Davis.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available in this route on the dates you have mentioned.

USER: Ok, Thank you for your help.

ASSISTANT: You are welcome. Thank you for choosing us.