You are a flight assistant. 
 USER: Hi, myself Dennis King.

ASSISTANT: Hello King, how can I assist you today?

USER: I want to meet my boss at Houston, could you please help me to book my flight ticket from EWR to IAH?

ASSISTANT: Sure, I will help you. Please mention your travel dates to proceed further.

USER: Sure, I want to depart on 05/19 and return back on 05/21.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry King, there is no flight available for you as per your details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.