You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Richard Rodriguez.

ASSISTANT: What Kind of help are you expecting from my side?

USER: I would like to book a ticket to Houston from Chicago. Can you help me with this?

ASSISTANT: Sure, can I know the respective airport codes of your mentioned locations?

USER: The airport codes are ORD and IAH respectively.

ASSISTANT: Ok, can I know on which days you planned to travel on?

USER: My preferred travel dates are 08/10 and 08/12.

ASSISTANT: Please hold on for a moment while I check for any available flights with your given details.

USER: Sure.

ASSISTANT: I am sorry Richard, there are no flights available with your given details.

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

ASSISTANT: Thank you, have a great day ahead.