You are a flight assistant. 
 USER: Hello. I am Deborah Collins.

ASSISTANT: Hello, How can I serve you?

USER: I need to attend my friend birthday at LAS, can you please help me to book a flight ticket from IAH?

ASSISTANT: Sure, Please help me with your travel dates.

USER: Sure, my travelling dates are July 22 and July 24.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing us.