You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Nancy Williams.

ASSISTANT: How can I assist you?

USER: I would like to meet my family on this upcoming festival, can you please help me with booking a ticket?

ASSISTANT: Sure, can you please tell me trip dates and city codes?

USER: I want to travel from HOU to LAS. The dates are from 06/17 to 06/19.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Yes, there is a flight available for you, can I proceed to book a ticket?

USER: Ok, please book the ticket.

ASSISTANT: Ok, your flight is booked successfully.

USER: Ok, thank you for your help.

ASSISTANT: Most welcome.