You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Rodriguez.

ASSISTANT: How may I assist you?

USER: I want to book a ticket from HOU to LAS to attend seminar, can you help me in booking?

ASSISTANT: Sure, I am oblige to assist you in flight ticket booking process and may I know your ongoing and backward travel dates?

USER: I am departing on 01/03 and return on 01/05.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked based on your preferable dates but I got the information that there is no flight due to sold out of flight tickets.

USER: Please proceed for booking. That's ok, I will check for other alternative.

ASSISTANT: Ok, thank you for reaching us. Have a nice day.