You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I lend a hand to?

USER: Can you render me in booking a flight ticket from EWR to IAH?

ASSISTANT: Sure, I am here to help you for this. When are you planning your trip?

USER: I am planning to start on Apr 20th and return back on Apr 22nd.

ASSISTANT: Is there any credentials regarding your journey?

USER: Make sure that it is a direct flight.

ASSISTANT: Do you have any other criteria?

USER: No.

ASSISTANT: Please wait for a while.

USER: Take your time.Book the ticket on the name Gregory Lopez.

ASSISTANT: Sorry for inconvenience, no flights are found with your credentials.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you very much for contacting our agency.